Today I was fireforming brass for a new 25-06ai. Been using nosler box ammo all have fired fine and look good. First 20 shots 2 weeks ago shot great to properly break in barrel and was cleaning with a couple patches. Went out to shoot this evening first one in bullseye and next 2 were straight down 2 inches and 1/2 inch group at 200 yards. Let barrel cool down and shoot anther 2 groups and same results. Do you think it is from fireforming to ai, just does not like ammo, need cleaned, something lose, have not shot any fireformed ammo!