Probably kind of a hard consept to get your mind around, but there is lots of energy stored in the rotation of a bullet, as stated above, the energy level can exceed the strength of the bullet at the extremes, probably not something to worry about unless you are pushing the limits of velocity with a fast twist barrel. There was good reason for the origional 22-250's to have a 1 in 14 twist, I had one with a 1 in 17 twist and it would do really really well with 40gr bullets. Just something most people don't run into until they are approaching the extremes. Just from observation, when a bullet is very close to turning to dust from rotational speed, it will leave little pinwheel marks on the target paper, I don't know what the marks are from, but if you up the speed by another 50fps they will not make it to the target. Having a faster than normal twist barrel can solve some problems but it can also create a few that are normally not thought of. Larry