Originally Posted by
doubleA
Dont know about that, I just finished a 243 Win build with a 30 inch Krieger 7.5 twist(it's throated for the 115gr DTAC). Using a 105gr Amax, 3 out of 5 shots the bullet comes apart at about 35 yards from the muzzle. Having taken videos for bullet trace shows the little white puff of smoke is how I know, that and there are no holes on the target.
Probably it's a combination of speed, twist and jacket construction.
I was going to mention that...it could happen if you are pushing a thin jacket fast out of a long tube. But since the OP was talking hunting bullets I didn't want to confuse him...
Except, that seems really odd that they are coming apart on you out of a .243 Win. My 1/8 isn't THAT much slower then your 1/7.5 and it shoots the 105 A-Max, 95gr B-Tip and 87gr V-max really good.