But the nastiest thing the Ball experiences is the blast of air accelerating it to 300fps in 6 milliseconds. As has been said else where, the forces on the ball once air is applied are perfectly distributed in the rear and transfered to the ball face by the paint. The ball remains round and is infact forced round by gas pressure.
Originally posted by deded
It seems that this would make a closed bolt design more accurate then an open bolt design, except for at high rates of fire. I.E. The ball is pushed into the chamber and deformed, but has time to reshapen before the blast of air pushes it out of the barrel... where as the open bolt hits the ball, deforms it, and then instantaneously shoots it out the barrel, possibly not allowing the ball to re-round as quickly as the closed bolt would.