My .243 WSSM shoots the 62 grain Varmint Grenade at a tad over 3,600 fps through a 1:8" barrel with no problems of disintegration. Same with the 1:9" .223 Remington barrel and the 36 and 50 grain V.G., and Nosler 35 grain Lead Free. Of course these bullets have a sintered powdered metal aggregate core which is harder and less plastic than lead cores, so they may be able to handle rotational and velocity forces better. I have tried to disassemble these bullets, and found the cores to be extremely hard and well bonded to the jacket. Unlike a lead core bullet they can't easily be dug out or scratched with an engraver. I believe they act more as a solid until impact.
I think the problem of rotational or centrifugal forces from a faster twist barrel is greatly exaggerated. I have had bullets vapor trail and puff out before 200 yards in 1:14" and 1:12" twist .22-250 and .220 Swift barrels because of bullet construction, thin frangible jackets and soft lead cores expressly made to disintegrate. Meanwhile, the Sierra 55 grain semi-pointed merrily went all the way to squirrel detonation.
Most competition bullets are made with thinner more consistent jacket walls. My stash of Sierra .30 caliber match jackets walls measure .0125" thick, nothing like the heavier jackets of some non-match jackets let alone the Barnes, Nosler or Hornady expanding copper bullets. Draw these jackets to .284" cut them shorter and process them through three swagging dies and it's a wonder they work at all.
Another factor may be the barrel itself. Rough sharp edges on lands and grooves will engrave stress points on a jacket, acting somewhat like a folded crease we put on paper to tear it cleanly. Add the friction heating of two dissimilar metals and stress of firing - poof! To avoid the barrel problem, I recommend a 5R or polygonal barrel for fast twist applications, or a cut rifled lapped barrel. The rounded corners of the 5R or polygonal barrel are easier on bullets. If a barrel is copper fouling heavily, it's tearing jacket metal off the bullet, acting like a cylindrical file. My 1:9" Pac-Nor polygonal is extremely accurate with the 50 grain .224 V.G. in .223 Remington and, like the lapped cut rifled barrel, cleans up with a few wet patches. Accuracy with the faster twists has greatly improved, eliminating unexplained fliers.
That's my opinion - which does not necessarily mean anything.
