Just wanted to post a little info about the criterions, I recently purchased a 30" bull 6br 1-8 twist from Mr. Briggs at NSS after shooting it the results where better than I had expected sub moa out to 600. So I ordered a 30" bull 308 win 1-10 twist just put it into action and wow sub moa at 100 waiting on the rain to leave to go out to six , Both barrels or on Savage target actions with F class stocks.