One of the Ars I'm thinking about listed above is a LR 308 using this
https://www.nosler.com/308-wincheste...mmunition.html
Question I have is about twist rate for this round. Most AR 10 uppers and readily available barrels have a 1 in 10. I'm thinking with the weight and speed I would need maybe a 1 in 12 twist. The online twist calculators aren't much help. Hard to find twist readily available but plenty of custom barrel makers to do so. Appreciate any thoughts and opinions on my little dilemma.