Barrel Twist

[Big Nasty]

I think I am in the right area for this topic. I checked in the FAQ's to get my bbl twist rate for my .204 UV and my .308 survivor, and if memory serves me correct is this right. If you have a 1 in 12 twist that means the bullet is turning one time per every twelve inches. so on a 1 in 12 it will turn two complete times in a 24 inch BBL before exit. Also the lower the second number  1 in 9 lets say, 9 will have better control on heavier gr bullets. Opposed to a 1 in 12 will have better control on lighter grain bullets. Also for instance if you shot a .204 32 grain round in a 1 in 8or9 twist BBL wouldn't it fly apart due to cintrifical force. They probably don't make .204 bbl's with a 1 in 8or9 twist well they might but i don't think it's common for that reason. I really hope I'm right on these questions because if not I will have to retrain my brain, and there ain't much there to retrain.       

[cwlongshot]

Yes, your basically correct. The faster the twist, the heavier the bullet it will stabilize.

  Bullets spinning too fast is only part of the equation when a bullet desintigrates. It usually only happens with lightly constructed jacketed varmint bullets, fired at high velocities from rifles with "sharp" rifling.
 I experienced it with my then new 788 Rem in 22-250 when shooting Sierra BLITZ bullet handloads. It didn't happen every shot, but a couple times I shot and the bullet never made it to the target. Then with the second shot you would see only one bullet hole in near the bull.

CW

[Singleshotsam]

I had a M70 .223 WSSM that would overstablize lighter varmint bullets and cause a couple to fly apart.  We tried shooting them @ 50 yards and occasionally you would see what looked like tiny shotgun hits next to a bullet hole...