Both. I typically shoot a 12 and love it. Been toying with a 10 some and it's not bad but not quite as good as several of my 12 twists. It may just be that bbl is not quite up to par with those. Not sure. It still shoots the lighter bullets tighter than it will the 87-95's though. I think it's tough to truly over stabilize something. But bullet length seems to be more important in terms of very best accuracy. Gotta have faster twists for heavier, longer bullets and that bc is important at longer range. I plan to try the 10 twist with 95 BIBS or similar at 600, though. Like I said, not ideal but they hammer pretty dang well. The rest is up to me. The 95 BIB and 87 Hillbilly have been the best two heavyish bullets in it. 90 Bergers aren't bad but inconsistent.you shooting 12 or 10 twist in your Grendel?/
stan
Either way, I have come to actually prefer the 12 twist, even for the 68 class bullets over the common 13.5-14 twist. I see it as a positive. This is after boat loads of 13.5's and a bunch of 12's now. I don't think I'll ever go back to the 13.5-14's
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