10-09-2020, 05:40 AM
PGW Steve Wrote:While not specific to the 6mm ARC, I do have some experience with extreme twists and bullet weight ranges. Over 20 years ago, I had a 6mm-284 with a 1/7 twist to shoot Sierra 107's at 3250 IIRC. I was going on a varmint hunt in Nebraska, and worked up a load with 70 grain Nosler BT's. I managed to push those at 4100 or so, and none of them came apart. Accuracy for both was around 1/2 MOA at 300 yards. Ever since that rifle, I've never had any fear about over spinning a bullet. Unless of course it's a light jacketed bullet and it flat out blue streaks. I don't think the ARC will have a problem with such a small powder charge compared to the 284 case.
The 70 Grain NBTVs are pretty devastating at 3k out of my 6x45 - I can't imagine them at 4100. Do you know how many grooves your rifling had? I think this comes into play with the centrifical force on the jacket as the bullet is spinning down a barrel. I'm not a physicist or engineer, but I think a jacket in a 6 groove barrel would hold up better than in something like a 3 groove BHW barrel where it could be slipping and/or deforming.
Let's go Brandon!