Quote:
|
Recoil energy is a precise, physical quantity that is a function of the weight (mass) of the bullet, the weight (mass) of the powder charge, the muzzle velocity of the bullet, the muzzle velocity of the powder gases, and the weight (mass) of the gun.
|
There's another factor in play. The rate of acceleration and the force requirement...or the force applied...to achieve that rate.
Force forward=Force backward.
If the force requirement to accelerate a 185 grain bullet to 1100 fps is greater than the force requirement to accelerate a 230 grain bullet to 830 fps, the force backward with the lighter, faster round will produce more recoil...or vice-versa.
Something else that is only occasionally considered is that the recoil generated in an autopistol doesn't behave the same was as it does in a revolver or single-shot/fixed breech pistol. Most of what we perceive as recoil is muzzle flip, which is actually momentum. We don't perceive much of the actual recoil impulse...not that we're fully aware of. It's over before our brain can process that something happened to our hand.
With the autopistol, the disconnect is even wider. In these, the gun is comprised of the barrel and breechblock...the slide...and the frame is essentially no more than the gun mount...and the only connection between the gun and the mount is through springs. With the auto, about 90% of the muzzle flip happens when the slide impacts the frame...and by the time that happens, the bullet is about 20 yards downrange...and the original action/reaction that took place when the round fired is long since over...relatively speaking.