Looking at 20" .308 Criterion barrels for a 308 AR build, 1-10 or 1-11. I normally use 175's for all my loads when shooting NRA midrange and long-range (800-1K). Tech at Criterion says either will work fine. My F-T/R rifle is 1-10 and the LRB M14 is 1-11 and both do the 175's fine. Just looking...