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In my experience the gun will continue to tighten up for about the first 50-100 rounds as you smooth the bore. After that I don't clean as much as it can change my POI. If you play with the powder charge in .3 grain increments I bet you can get that gun to .5 MOA or below.
Barnes X bullets can like to be seated a bit longer in some guns. The X bullet is longer than a bullet of the same weight in lead/copper.
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