Originally Posted by

**Steve M1911A1**
The heavier bullet necessarily moves more slowly. That's because there is a limit on chamber pressure, which, in turn, puts a limit on the velocity which can be imparted to a given mass. A less massive bullet, given the same pressure limitation, can be propelled at a greater speed.

The heavier, slower bullet spends more time in the barrel, compared to a lighter (and therefore faster) projectile going through the same barrel.

But recoil, which begins at the instant of firing, operates on the elevation of the barrel's muzzle during a period of fixed length which is independent of bullet weight.

So the lighter, faster bullet comes out of the barrel sooner, before the barrel's muzzle reaches full recoil-induced elevation. The heavier, slower bullet exits later, after the muzzle has elevated somewhat further than it would have at the moment of the exit of the lighter bullet.

Does that make it clear?

If not, ask more questions.