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The problem is that with your method of polishing you will both widen the chamber AND move the shoulder forward. And since you can't easily do a barrel reset and chamber recut on a gas operated semi-auto, this might be a good point for a chamber cast to find out how much room you actually have.
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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.
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