Thanks for the info Frank! I'll try the 90gr SMK next in my 223AI. It's Benchmark 6r. Yeah, over at Saubier that 9 twist was the suggested twist at the time, like 5 years ago, for those 55's. Wish I'd ordered a slower twist. And well, gone with 20BR too. Going with your 5r's if doing a shouldered barrel from now on. Would be cool if you'd start doing Savage prefits in 5r at some point! Haven't had any problems with 6mmBR, 105 hybrid in a 8 twist, surprising huh?!