ps.02 wrote:Flumble wrote:Ah yes, I forgot to mention that explicitly: dropping the gun doesn't affect the velocity of the bullet radically. I'm not sure about the effects on the maximum height, though.
How much of muzzle velocity is attributable to bracing the gun and absorbing the recoil? My brain is too fuzzy this morning to do the math on that. Intuitively it seems like the bullet would come out noticeably slower if the gun is in free fall, as opposed to braced against the ground or your shoulder, but my intuition could be wrong. Perhaps the ratio of gun to bullet mass is already great enough for the difference to be negligible.
For a .22LR, such as the standard Remington 10-22, the recoil is fairly low. For a rifled slug shotgun, or a 50-caliber rifle, the recoil is fairly high. Leaving the gun unsecured by a shoulder or other back-plate will definitely affect the muzzle velocity, as per Newton's Third, but to a different degree on every gun, depending on the style of gun (semi-automatic or single-shot), gas mechanism (if any) and spring strength of the semi-automatic system, etc. A semi-automatic shotgun will have less recoil due to the gas mechanism absorbing and converting the energy into an ejection of the shell, but that doesn't mean that the muzzle velocity is reduced, the recoil is just used differently. I don't think that an un-braced semi-automatic shotgun would cycle or eject reliably, though.
See also: ballistic pendulums, etc.