Ive got a barrel that Im back and forth on replacing. I got a heck of a deal on a savage lrp 6.5 creedmoor that I was intending to rebarrel to a 22-250. I figured it cant hurt to shoot it as is right? After finding a load pretty fast I cleaned it as best as I can. Well with a squeaky clean bore this thing will print a 2" group and then after the 5th shot it will shoot in the 1's and 2's for the next 40 rounds or so ( maybe more?) Ive never seen a barrel go from terrible to excellent like that. Ive had plenty that will need a fouler or two but with a proven load its never been so extreme. What causes that?