This^^
I also shoot the 22-250... although I shoot a 55 gr. @ only 3300 fps... You're pushing those 60 grainers faster than I push my 55's... you've probably toasted the lands a bit, so you'll have to find where the lands starts now... or start seating the bullet longer and see if it starts to tighten back up. my original load development for my CBI barrel was 2.10 measuring to the OG. now I'm out to 2.15 after 1000 rounds maybe just a bit less.
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