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I'm playing with a Rem 580 ,22 RF, and with epoxy bedding, two action screws, and the trigger at 1 lb, with the breech cutback to a tight seat, the thing shot my last 5 rds of Lapua center X into a 3/8" group at 50 yds off a bag. But in the borescope, the barrel has little pits all down the barrel! Is this a situation of if it ain't broke, don't fix it? Or should I go the next step, and put on a real sporter BR contour barrel. Will do more testing, to see if the barrel goes south after 20 shots, but it's cold out there, now, and calm winds hard to come by. No more Lapua left, only Wolf, which shoots almost as tight.