Oly Arms k16, 1-9bbl, Bushell elite 4-12x40 . shooting 62 grain Bear and wolf. ive been through about 2000 rounds of mostly brown bear and silver bear. I was shooting the other day at some squirrels that were trespassing at about 200 yards from the porch. missed one, hit one in the heart, missed another, and nicked one that about jumped right out of his body. They ravenge my deer feeder but i dont like to leave anything injured so i decided to put a few groups on paper. I put a target at 180yds and was surprised how loose my groups were. wind was barely moving and gun was in a sight vice. Ive heard of comp shooters going through barrels, but how many rounds does it take? Is mine just broke in or on its way out?