6mm arc maybe not that versatile.

[tdbru]

Sierra has a warning on the box of 85gr. 6.5mm about being medium velocity or lower. forget off the top of my head, but i had them loaded as fast as safely possible in a 6.5x55 Win M70 with a twist of 1-7.87 according to the hang tag. and they came apart shortly after muzzle exit. not every time. but occasionally. So i kept them all now for my 6.5 Grendel and don't run them faster than what i can get out of my 6.5 Gr. I'd heard of very thin jacketed varmint bullets having jacket failure due to high rotational speed and always thought it an "urban legend" so to speak. until it happened to me a couple of times with that 6.5x55. The 6.5mm 85gr. Sierra works very well as a varmint bullet out of the Grendel so no complaints, i just use them in the 6.5 Gr.
-tdbru