After many years of problems with Pistols, this paragraph has helped me
c. Isometric Tension. The firer raises his arms to a firing position and
applies isometric tension. This is commonly known as the push-pull method
maintaining weapon stability. Isometric tension is when the firer applies
forward pressure with the firing hand and pulls rearward with the
hand with equal pressure. This creates an isometric force but never so
cause the firer to tremble. This steadies the weapon and reduces barrel
from recoil. The supporting arm is bent with the elbow pulled downward.
firing arm is fully extended with the elbow and wrist locked. The firer
experiment to find the right amount of isometric tension to apply.
NOTE: The firing hand should exert the same pressure as the nonfiring
it does not, a missed target could result.
FM 23-35 CHAPTER 2 ( Markmanship Training )
which is part of
FM 23-35 COMBAT TRAINING WITH PISTOLS & REVOLVERS, 03 OCT 1988