Credits - Download as Excel

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					Kevin D. Allen
aka: Kiltboy
3711 Summer Rose Court
Chamblee, GA 30341
(770) 457-2393
kevin.allen@mindspring.com
www.airgunningatlanta.com

I could not have produced this little ditty without the help of some great people so I'd like to list my
sources here and thank especially Bob Winer for his assistance when I had questions or needed
clarification. Bob assisted by providing the Wind Drift formula used in the computations as well as
through encouragement and direction when I didn't seem to have any. Thanks Bob! It's been nice
working with you on this project. =]

I need to also site some resources as follows:

U.S. Airgun Magazine
October-December 1994; Comparing Pellet Aerodynamics by Dave Shames pp. 31-32

U.S. Airgun Magazine
April-June 1995; Trials Tribulations, and Trajectories by Dave Shames pp. 14-15

U.S. Airgun Magazine
October-December 1995; An Airgun Trajectory Program by Dave Shames pp. 10-11
www.usairgun.com

The Airgun Trajectory Program source code by Robert Winer and Dave Shames

Understanding Firearm Ballistics by Robert A. Rinker

ScopeKnob software by Eric Sanders
www.compufoil.com/scopeknob.html

Kevin Gilbride and Craig Porter at Straightshooters.com for providing valuable velocity data used in the
VRF tables. They offer a great website to back up their great customer service.
www.straightshooters.com

And finally Ken Hughes and Tommy Garland of Airgunning Atlanta Field Target Club for bitching and
moaning about the things they didn't like from the existing airgun trajectory software available in the
market.
Given Data
             All shooting distances are measured in yards!
             Choose Save As… from the File Menu when you are done to save all of your pertinent data in one easy file for later
             Remember to check for updates periodically. They will be labeled with the release date in the file name.
             www.airgunningatlanta.com

Data Sheet
             ***The bold bordered fields are the minimum required data to get your complete trajectory data.

                       Scope
                                   Given Click Value

                             Calculated Click Value




                                 Turret Subdivisions




              Rifle & Scope
                                         Scope Height




                                Natural Primary Zero




                                           Slope Angle


                               Hunter Hold Minimum




              Rifle & Pellet
                               Vel. Retention Factor
                                              Muzzle Velocity




                          Constants
                                                 Gravitational

                                                  Denominator

                                              Traj. Coefficient




                                                   MoA Factor



                                           Cross Wind Speed

                        Read World
                                                   Data Values




Dial & Hold Charts
                     Both charts have a notes field in the bottom right corner. Just click and start typing.
                     Print out the charts on opaque paper and fold them along the line indicated. You can then laminate them at a local K

                      Hunter Class
                                                          HHold

Scope Knob Export
                     Use the File Menu --> Save As… option to save this page as a .TXT file.
                     That file can then be imported into Eric Sander's ScopeKnob program using the ATEAB File Import option.
                     www.compufoil.com/scopeknob.html

        VRF Data
                     Use the Calculator to input your Muzzle and 10 Yard Downrange velocites to determine your VRF.
                     You can add your own data to the bottom of the chart for future reference.
sured in yards!
e Menu when you are done to save all of your pertinent data in one easy file for later use.
s periodically. They will be labeled with the release date in the file name.




e the minimum required data to get your complete trajectory data.



               Enter manufacturer supplied click value here. Calculating this value
               is more accurate and is preferred for better trajectory numbers.
               Measure the clicks needed to move your crosshairs 1" at 10 yards.
               Do this with your scope locked in place and a ruler set at a measured
               10 yards from the end of the bell.
               **The Given Click Value, if you input it, will override this
               calculation. Just delete the Given Click Value it to get the
               Calculated Click Value to work.
               This is the subdivisions your elevation turret is divided into. For
               instance, a Leupold 1/8MoA turret has numbers 1, 2, 3 etc. with 8
               subdivisions between them. If you enter 8 here then the click values
               will show 2.2 instead of 18 to make it easier to click. Entering a 1
               here will just give you the number of clicks without any extras.

               Measured from the center of the bore to the center of the scope tube.
               Take half the scope tube width (.5") and add it to the calipered
               distance from the bottom of the tube to the top of the receiver (+
               .75") and add half the diameter of the receiver (+ .64") to obtain the
               scope height. (= 1.89")
               This is a debated variable definition. I personally like to pick the top
               most point on my trajectory (hense the "Natural Primary" moniker) so
               that all of my dial rotations are only in one direction. This gives me
               one less thing to worry about when shooting. Start with a guess of 25
               yards and then look at your trajectory to see if that is in the middle of
               the flat spot at the highest part of your trajectory. If it isn't, then just
               change the Primary Zero number afterwards to match where that top
               part is. The Hunter Hold calculations rely on you inputting the Natural
               Unimplemented currently
               Enter the angle at which you are shooting. Positive numbers for
               uphill and negative numbers for downhill.
               This is designed for Hunter Class/Sport Air Rifle Field Target
               specifically although hunters in general may find it useful. This
               number represents the area in which you can hold dead on and still
               hit a target of this size. The HHold column shows where you should
               ZERO your rifle and what minimum hold you will have to maintain to
               keep wthin this Hunter Hold Minimum.

               Pellet Velocity Retention Factor. This is the pellets ability to retain
               velocity as it moves downrange expressed as a ratio of muzzle
               velocity to 10 yards downrange measured velocity. Enter a VRF from
               the VRF Data charts. All VRF data is measured at the muzzle and at
               10 yards only. NOTE! Muzzle velocities over 925fps will give you
               more and more invalid VRF numbers as muzzle velocity increases.
               The velocity of the pellet as it leaves the muzzle. Some measure this
               at the muzzle directly with a 10M-style clamp on chronograph while
               others recommend that you use a traditional chronograph placed a
               yard away from the muzzle to give the most accurate readings. The
               important thing to remember, is that your VRF MUST be read 10
               yards further downrange than wherever you read your Muzzle

               Accelleration due to Gravity measured in Feet per Second per
               Second. This number shouldn't be changed.
               Used to determine energy reading in foot pounds. This number
               shouldn't be changed.
               This flattens or steepens the trajectory curve. Use this to correct for
               altitude or other environmental conditions. The valid numbers are
               from 175 to 192 but my experience shows that 168 is the optimal
               number to use for my shooting conditions.
               Minute of Angle Factor is the distance one Minute of Angle moves at
               100 yards. Use 1.0472 if you are using the manufacturer supplied
               scope click value. Use 1 if you are using your own (preferred)
               measured click value.
               How fast is the 90 degree cross wind blowing your pellets. This will
               give you cross wind drift measured at all of your distances.

               The numbers you enter in these cells are values you have shot after
               zeroing your scope to the same Primary Zero chosen in the Rifle
               & Scope section above. These values are then graphed against the
               computed values on the Trajectory Graph so that you can see how
               your computed numbers compare to the actual values you are
               shooting. Modifying the Trajectory Coefficient, Scope Height,
               Click Value, and VRF all affect the computed values so it will
               allow you to tweek the numbers to match your real world findings.



n the bottom right corner. Just click and start typing.
paper and fold them along the line indicated. You can then laminate them at a local Kinko's.


               See Hunter Hold Minumum above.



… option to save this page as a .TXT file.
nto Eric Sander's ScopeKnob program using the ATEAB File Import option.




 Muzzle and 10 Yard Downrange velocites to determine your VRF.
he bottom of the chart for future reference.
            Name                                           Dist     Dial   HHold     Drift    FPE Dist         Dial   HHold    Drift    FPE Dist Dial
                    First                                      8   #####   #####    #####    #####  29        #####   #####   #####    #####  50 #####
                    Last                                       9   #####   #####    #####    #####  30        #####   #####   #####    #####  51 #####
            Rifle                                            10    #####   #####    #####    #####  31        #####   #####   #####    #####  52 #####
          Manufacturer                                       11    #####   #####    #####    #####  32        #####   #####   #####    #####  53 #####
                 Model                                       12    #####   #####    #####    #####  33        #####   #####   #####    #####  54 #####
           Pellet                                            13    #####   #####    #####    #####  34        #####   #####   #####    #####  55 #####
          Manufacturer                                       14    #####   #####    #####    #####  35        #####   #####   #####    #####  56 #####
                 Model                                       15    #####   #####    #####    #####  36        #####   #####   #####    #####  57 #####
                Caliber                                      16    #####   #####    #####    #####  37        #####   #####   #####    #####  58 #####
                Weight            grains                     17    #####   #####    #####    #####  38        #####   #####   #####    #####  59 #####
Die # or Sizing Die Size                                     18    #####   #####    #####    #####      39    #####   #####   #####    #####   60    #####
            Scope                                            19    #####   #####    #####    #####      40    #####   #####   #####    #####   61    #####
           Manufacturer                                      20    #####   #####    #####    #####      41    #####   #####   #####    #####   62    #####
                  Model                                      21    #####   #####    #####    #####      42    #####   #####   #####    #####   63    #####
      Given Click Value                                      22    #####   #####    #####    #####      43    #####   #####   #####    #####   64    #####
Calc. Click Value        clicks                              23    #####   #####    #####    #####      44    #####   #####   #####    #####   65    #####
    Turret Subdivisions           clicks per subdivision     24    #####   #####    #####    #####      45    #####   #####   #####    #####    70   #####
                Mounts                                       25    #####   #####    #####    #####      46    #####   #####   #####    #####    75   #####
    Rifle & Scope                                            26    #####   #####    #####    #####      47    #####   #####   #####    #####    80   #####
           Scope Height           inches                     27    #####   #####    #####    #####      48    #####   #####   #####    #####    90   #####
  Natural Primary Zero            yards                      28    #####   #####    #####    #####      49    #####   #####   #####    #####   100   #####
            Slope Angle 0         degrees
  Hunter Hold Minimum 1           inch(es)                 Dist    Time     Vlcty    Drop     MoA    Clicks   HHold    FPE     Drift   D MoA Dist
    Rifle & Pellet                                             8   #####   #####    #####    #####   #####    #####   #####   #####    #####     8
  Vel. Retention Factor                                        9   #####   #####    #####    #####   #####    #####   #####   #####    #####     9
        Muzzle Velocity           fps for 0fpe               10    #####   #####    #####    #####   #####    #####   #####   #####    #####   10
        Constants                                            11    #####   #####    #####    #####   #####    #####   #####   #####    #####   11
          Gravitational     32.1741                          12    #####   #####    #####    #####   #####    #####   #####   #####    #####   12
           Denominator      450437.4                         13    #####   #####    #####    #####   #####    #####   #####   #####    #####   13
       Traj. Coefficient    168                              14    #####   #####    #####    #####   #####    #####   #####   #####    #####   14
            MOA Factor      1                                15    #####   #####    #####    #####   #####    #####   #####   #####    #####   15
      Cross Wind Speed      1     mph crosswind              16    #####   #####    #####    #####   #####    #####   #####   #####    #####   16
       Real World                                            17    #####   #####    #####    #####   #####    #####   #####   #####    #####   17
                      10          #NUM!                      18    #####   #####    #####    #####   #####    #####   #####   #####    #####   18
                      15          #NUM!                      19    #####   #####    #####    #####   #####    #####   #####   #####    #####   19
                      20          #NUM!                      20    #####   #####    #####    #####   #####    #####   #####   #####    #####   20
                      25          #NUM!                      21    #####   #####    #####    #####   #####    #####   #####   #####    #####   21
                      30          #NUM!                      22    #####   #####    #####    #####   #####    #####   #####   #####    #####   22
                      35          #NUM!                      23    #####   #####    #####    #####   #####    #####   #####   #####    #####   23
                      40          #NUM!                      24    #####   #####    #####    #####   #####    #####   #####   #####    #####   24
                      45          #NUM!                      25    #####   #####    #####    #####   #####    #####   #####   #####    #####   25
                      50          #NUM!                      26    #####   #####    #####    #####   #####    #####   #####   #####    #####   26
                      55          #NUM!                      27    #####   #####    #####    #####   #####    #####   #####   #####    #####   27
                                                             28    #####   #####    #####    #####   #####    #####   #####   #####    #####   28
                                                             29    #####   #####    #####    #####   #####    #####   #####   #####    #####   29
                                                             30    #####   #####    #####    #####   #####    #####   #####   #####    #####   30
                                                             31    #####   #####    #####    #####   #####    #####   #####   #####    #####   31
                                                             32    #####   #####    #####    #####   #####    #####   #####   #####    #####   32
                                                             33    #####   #####    #####    #####   #####    #####   #####   #####    #####   33
                                                             34    #####   #####    #####    #####   #####    #####   #####   #####    #####   34
                                                             35    #####   #####    #####    #####   #####    #####   #####   #####    #####   35
                                                             36    #####   #####    #####    #####   #####    #####   #####   #####    #####   36
                                                             37    #####   #####    #####    #####   #####    #####   #####   #####    #####   37
                                                             38    #####   #####    #####    #####   #####    #####   #####   #####    #####   38
                                                             39    #####   #####    #####    #####   #####    #####   #####   #####    #####   39
                                                             40    #####   #####    #####    #####   #####    #####   #####   #####    #####   40
                                                             41    #####   #####    #####    #####   #####    #####   #####   #####    #####   41
                                                             42    #####   #####    #####    #####   #####    #####   #####   #####    #####   42
 43   #####   #####   #####   #####   #####   #####   #####   #####   #####    43
 44   #####   #####   #####   #####   #####   #####   #####   #####   #####    44
 45   #####   #####   #####   #####   #####   #####   #####   #####   #####    45
 46   #####   #####   #####   #####   #####   #####   #####   #####   #####    46
 47   #####   #####   #####   #####   #####   #####   #####   #####   #####    47
 48   #####   #####   #####   #####   #####   #####   #####   #####   #####    48
 49   #####   #####   #####   #####   #####   #####   #####   #####   #####    49
 50   #####   #####   #####   #####   #####   #####   #####   #####   #####    50
 51   #####   #####   #####   #####   #####   #####   #####   #####   #####    51
 52   #####   #####   #####   #####   #####   #####   #####   #####   #####    52
 53   #####   #####   #####   #####   #####   #####   #####   #####   #####    53
 54   #####   #####   #####   #####   #####   #####   #####   #####   #####    54
 55   #####   #####   #####   #####   #####   #####   #####   #####   #####    55
 56   #####   #####   #####   #####   #####   #####   #####   #####   #####    56
 57   #####   #####   #####   #####   #####   #####   #####   #####   #####    57
 58   #####   #####   #####   #####   #####   #####   #####   #####   #####    58
 59   #####   #####   #####   #####   #####   #####   #####   #####   #####    59
 60   #####   #####   #####   #####   #####   #####   #####   #####   #####    60
 61   #####   #####   #####   #####   #####   #####   #####   #####   #####    61
 62   #####   #####   #####   #####   #####   #####   #####   #####   #####    62
 63   #####   #####   #####   #####   #####   #####   #####   #####   #####    63
 64   #####   #####   #####   #####   #####   #####   #####   #####   #####    64
 65   #####   #####   #####   #####   #####   #####   #####   #####   #####    65
 70   #####   #####   #####   #####   #####   #####   #####   #####   #####    70
 75   #####   #####   #####   #####   #####   #####   #####   #####   #####    75
 80   #####   #####   #####   #####   #####   #####   #####   #####   #####    80
 90   #####   #####   #####   #####   #####   #####   #####   #####   #####    90
100   #####   #####   #####   #####   #####   #####   #####   #####   #####   100
HHold    Drift    FPE
#####   #####    #####
#####   #####    #####
#####   #####    #####
#####   #####    #####
#####   #####    #####
#####   #####    #####
#####   #####    #####
#####   #####    #####
#####   #####    #####
#####   #####    #####
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                                                                          Calculated Drop    Real World
                                                                                                          Trajectory
                                           10
                                                15
                                                     20
                                                          25
                                                               30
                                                                    35
                                                                         40
                                                                              45
                                                                                   50
                                                                                        55
                                    1.00




                                    0.80
Drop from Line of Sight in Inches




                                    0.60




                                    0.40




                                    0.20




                                    0.00
                                                                                                          Distance in Yards
Dist   Dial   Drift Dist Dial Drift Dist    Dial    Drift   Dist   Hold   Drift Dist Hold Drift Dist    Hold    Drift
   8   ####   ####    29 #### ####    50    ####    ####       8   ####   ####    29 #### ####    50    ####    ####
   9   ####   ####    30 #### ####    51    ####    ####       9   ####   ####    30 #### ####    51    ####    ####
  10   ####   ####    31 #### ####    52    ####    ####      10   ####   ####    31 #### ####    52    ####    ####
  11   ####   ####    32 #### ####    53    ####    ####      11   ####   ####    32 #### ####    53    ####    ####
  12   ####   ####    33 #### ####    54    ####    ####      12   ####   ####    33 #### ####    54    ####    ####
  13   ####   ####    34 #### ####    55    ####    ####      13   ####   ####    34 #### ####    55    ####    ####
  14   ####   ####    35 #### ####    56    ####    ####      14   ####   ####    35 #### ####    56    ####    ####
  15   ####   ####    36 #### ####    57    ####    ####      15   ####   ####    36 #### ####    57    ####    ####
  16   ####   ####    37 #### ####    58    ####    ####      16   ####   ####    37 #### ####    58    ####    ####
  17   ####   ####    38 #### ####    59    ####    ####      17   ####   ####    38 #### ####    59    ####    ####
  18   ####   ####    39 #### ####    60    ####    ####      18   ####   ####    39 #### ####    60    ####    ####
  19   ####   ####    40 #### ####    61    ####    ####      19   ####   ####    40 #### ####    61    ####    ####
  20   ####   ####    41 #### ####    62    ####    ####      20   ####   ####    41 #### ####    62    ####    ####
  21   ####   ####    42 #### ####    63    ####    ####      21   ####   ####    42 #### ####    63    ####    ####
  22   ####   ####    43 #### ####    64    ####    ####      22   ####   ####    43 #### ####    64    ####    ####
  23   ####   ####    44 #### ####    65    ####    ####      23   ####   ####    44 #### ####    65    ####    ####
  24   ####   ####    45 #### ####    70    ####    ####      24   ####   ####    45 #### ####    70    ####    ####
  25   ####   ####    46 #### ####    75    ####    ####      25   ####   ####    46 #### ####    75    ####    ####
  26   ####   ####    47 #### ####    80    ####    ####      26   ####   ####    47 #### ####    80    ####    ####
  27   ####   ####    48 #### ####    90    ####    ####      27   ####   ####    48 #### ####    90    ####    ####
  28   ####   ####    49 #### #### 100      ####    ####      28   ####   ####    49 #### #### 100      ####    ####


                 Field Target                               Hunter Class/SAR Field Target
   Name                                                        Name
    Rifle                                                       Rifle
   Pellet , gr., Die#                                          Pellet , gr., Die#
   Scope                                                       Scope
  Mounts                                               0      Mounts                                               0

           Data                                                         Data
  Scope Height     "                                          Scope Height     "
    Click Value                                                 Click Value
           VRF     0                                                    VRF    0
 Zero Distance      yards                                     Zero Distance     yards
 Muzzle Values     fps for 0fpe                              Muzzle Values     fps for 0fpe
                                                             Best Hold Min.    1"
    Constants                               Notes                Constants                              Notes
  Gravitational    32.1741        10/15/2002                   Gravitational   32.1741        10/15/2002
  Denominator      450437.4                                    Denominator     450437.4
    Traj. Coef.    168                                           Traj. Coef.   168
   MOA Factor      1                                            MOA Factor     1
 X-Wind Speed      1 mph                                     X-Wind Speed      1 mph
(ATEAB)
ScopeKnob Export
Use the File Menu --> Save As… option to
save this page as a .TXT file. That file can
then be imported into Eric Sander's
ScopeKnob program using the ATEAB File
Import option.
YARDS DIAL
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Head Design    Manufacturer   Model            Cal. WeightMuzzle Velocity 10y Velocity    VRF Measured By        Rifle
Round Nose     Crosman        Premier         .177     7.9      913           848        0.929  K. Gilbride    TX-200
Round Nose     Crosman        Premier         .177     7.9      883           822        0.931  K. Gilbride    Falcon
Round Nose     Crosman        Premier         .177     7.9      885           841        0.950 D. Shames unknown
Round Nose     Crosman        Premier         .177   10.5       794           754        0.950  K. Gilbride    TX-200
Round Nose     Crosman        Premier         .177   10.5       848           808        0.953  K. Gilbride Tomahawk
Round Nose     Crosman        Premier         .177   10.5       848           811        0.956 The Breeze Harrier SE
Round Nose     Crosman        Premier         .177   10.6       850           815        0.959 D. Shames unknown
Round Nose     Beeman         FTS             .177     8.6      868           812        0.935  K. Gilbride    TX-200
Round Nose     Beeman         FTS             .177     8.6      867           814        0.939  K. Gilbride    Falcon
Round Nose     Beeman         FTS             .177     8.6      865           807        0.933 D. Shames unknown
Round Nose     Beeman         Kodiak Match    .177   10.6       823           773        0.939  K. Gilbride    TX-200
Round Nose     Beeman         Kodiak Match    .177   10.6       809           766        0.947  K. Gilbride    Falcon
Round Nose     Beeman         Kodiak Match    .177   10.6       820           783        0.955 D. Shames unknown
Round Nose     JSB            Exact Diabolo   .177     8.4      880           800        0.909  K. Gilbride    TX-200
Round Nose     JSB            Exact Diabolo   .177     8.4      874           808        0.924  K. Gilbride    Falcon
Round Nose     JSB            Exact Diabolo   .177     8.4      795           757        0.952     K. Allen NJR-100
Hollow Point   Beeman         Crow Magnum     .177     8.7      879           794        0.903  K. Gilbride    TX-200
Hollow Point   Beeman         Crow Magnum     .177     8.7      852           776        0.911  K. Gilbride    Falcon
Round Nose     Webley         Lazapell        .177     8.7      880           820        0.932  K. Gilbride    TX-200
Round Nose     Webley         Lazapell        .177     8.7      864           811        0.939  K. Gilbride    Falcon
                  VRF Calculator
Muzzle Velocity             820
   Far Velocity             783
          VRF            0.9549

				
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