Mine was with an 11:25 twist Schneider 20” barrel and 155 AMax, and was very accurate with low SD. Because they’re mono bullets, would start at 41.5-42 and work up. Love AR Comp in 223/6.5GR and 308 with light bullets, but near impossible to find at the moment. Have 4lbs I’m holding and using 8208 as a sub, till ARC becomes available once again.