Once again, it's a rifle problem, plain and simple. Those bullets will manage just fine in fast twist barrels, no problem at all. Bullets will outgas (leave the smoke trails someone mentioned earlier) and even disintegrate when there's a barrel problem, which usually relates to roughness or sharp areas within the bore. This is true even when the bullets are "appropriate" for the twist. The year before last at Camp Perry, during the Small Arms Firing School we had a tremendous problem with Horandy 75 grain Match ammo blowing up halfway to the target. The rifles were provided by the army for the school, and were pretty high mileage; rough throats, lots of rounds through them. We were seeing 20-25% of the rounds fired failing to reach the target. Often time you'd see the smoke trails, other times yo saw the little FLAK burst halfway downrange. In some cases you saw both. The USMC clinic being run over on Rodriguez Range at the same time, was using the very same ammo, but with new rifles the USMC provided. They didn't have a bit of trouble with the ammo. This past year, RRA provided new rifles for the school, and Horandy again provided the same ammo. Not a single problem, anywhere, with bullets breaking up.
During the development of the BlitzKings (which actually DO have a thinner jacket), I ran some of them up to some ungodly velocities in a 22 CHeetah, 4,400-4,500 fps as I recall, and they still held together at better than 90-95%. Takes a lot to spin a bullet apart, unless the bore's a bit rough. Doesn't always take too much, but once you start to see it, you're there. Drop velocity, or stick to the heavier bullets and you've probably still got a good bit of usable life out of that barrel. But I can pretty well assure you, it's not a bullet problem.
