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.32 NAA
From Wikipedia, the free encyclopedia
The .32NAA is a cartridge/firearm 'system' designed and developed by
.32 NAA
the partnership of North American Arms and Cor-bon Ammunition.
Type Pistol
The cartridge is a .380 ACP case necked-down to hold a .32 caliber
bullet with the goal of improved ballistic performance over both the Place of origin United States
.380 ACP and the .32 ACP. Production history
Designer North American Arms / Ed Sanow
Contents Manufacturer North American Arms
1 History and Design Produced 2002
2 Performance
Specifications
3 Handguns
Parent case .380 ACP
4 See also
Case type Rimless, bottlenecked
5 References
Bullet diameter .3125 in (7.94 mm)
Neck diameter .3365 in (8.55 mm)
History and Design
Shoulder diameter .3729 in (9.47 mm)
Bottleneck handgun cartridge designs experienced early success and Base diameter .3740 in (9.50 mm)
have had continuing development since at least the 7.65x25mm Rim diameter .374 in (9.5 mm)
Borchardt or earlier, which lead to the development of the 7.63x25 Rim thickness .045 in (1.1 mm)
Mauser (also known as the .30 Mauser), followed by the 7.62x25
Case length .680 in (17.3 mm)
Tokarev. The benefits of bottleneck designs include smooth feeding
Overall length .984 in (25.0 mm)
and chambering and simple, robust headspacing.
Case capacity 10.5 gr H2 O (0.683 cm³)
The .32 NAA uses the .312" diameter bullet of the .32 S&W, .32 S&W
Rifling twist 1 in 16 in (410 mm)
Long, .32 H&R Magnum, and .327 Federal Magnum, not the .309"
Primer type small pistol
diameter bullet of the .32 ACP.
Maximum 25,700 psi (177 MPa)
The .32NAA is the most recent of a line of commercial bottleneck pressure
handgun cartridges. Renewed western interest in bottleneck handgun Ballistic performance
cartridges began with the .357 SIG in 1994 (necking a .40 S&W case
Bullet weight/type Velocity Energy
down to a .355 bullet); followed by the .400 Corbon in 1996 (necking
60 gr (3.9 g) JHP 1,222 ft/s (372 m/s) 199 ft·lbf (270 J)
a .45 ACP case down to hold a .40 cal. bullet); and then the .25 NAA
71 gr (4.6 g) FMJ 1,000 ft/s (300 m/s) 158 ft·lbf (214 J)
in 1999 (necking a .32 ACP case down to hold a .25 cal. bullet).
Test barrel length: 2.5
Performance Source(s): Cartridges of the World [1 ]
The cartridge delivers in excess of 1,222 ft/s (372 m/s) velocity to a 60-grain (3.9 g) proprietary bullet from Hornady. This
generates 199 ft·lbf (270 J) of energy from the 2.5" Guardian barrel (1453 ft/s & 287 ft·lbf (389 J) from a 4" test barrel). [2]
According to Phil W. Johnston, the 60 gr Corbon cartridge averaged 1204 fps, with an extreme spread of 69 fps and a
standard deviation of 19 fps, for 193.09 ft-lbs of energy. When fired at ballistic gelatin, he obtained 6.25" of penetration, with
expansion to 0.528" and 72% weight retention. [3]
Extreme Shock Ammunition offers an "Enhanced Penetration Round" that sends a 60 gr. bullet at 1196 fps for 190 ft lbs of
energy. [4]
Handguns
The North American Arms Guardian 32 NAA is designed around this cartridge.
Diamondback Firearms offers .32 NAA conversion barrels (2.8") for their DB380 pistols. [5]
[6]
Makarov.com once stocked barrels of two different lengths for converting Makarov pistols to .32 NAA.
See also
.25 NAA
List of handgun cartridges
7 mm caliber
References
1. ^ Cartridges of the World 11th Edition, Book by Frank C. Barnes, Edited by Stan Skinner, Gun Digest Books, 2006, ISBN 0-89689-
297-2 p.291
2. ^ North American Arms, 32 NAA Guardian, retrieved 2012 May 12
3. ^ Handguns, "The Mouse Gun That Roared," retrieved 2012 May 12
4. ^ Extreme Shock Ammunition, Enhanced Penetration Rounds, retrieved 2012 May 12
5. ^ Diamondback Firearms, .32 NAA Conversion Barrel for DB380, retrieved 2012 May 12
6. ^ Makarov.com, The .32 NAA Conversion for the Makarov Pistol, retrieved 2012 May 12
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