Best twist rate

[hellcat370]

Thanks for all the info Bill. I was able to get my hands on a 1/9 barrel, but the accuracy isn't great. I tested 4 different loadings, 123gr Lapua, 123gr sp Wolf, 120gr MTP Wolf, and the 90gr TNT Speer. I shot from 25 yds out to 280 with all rounds. Most held around 2.5-3 inch groups at 100yds. The 90gr TNT's did a lil better, and held 3 inches at 280yds. This was on par with the 14.5 1/8 AA Tactical I had a couple years ago, but it did better with the other ammo, save the 123 wolf because I hadn't shot any of that until recently. I also noticed that AA is now offering uppers using the 1/9 twist. Any ideas why this barrel isn't gettin decent accuracy?