I have a criterion barrel in 6br on an older 112 savage single shot. It has competed in IBS and F class regimens and has done quite well...till lately. The groups are opening up to where competing is really a challenge. I have been considering a new barrel. Problem is this combo still shoots a hair under 1/2 MOA out to 600 yards. (I gathered up 7 random targets, measured each group, and averaged the groups....avarage: minus 1/2 MOA.) I could spend the money and re barrel the gun and still have a half inch shooter. Anybody ever been there? Frustrating!