I usually swear by Kroil, if that doesn't get it loose it's cutting time. You might try heating with a heat gun, just in case someone "fixed" it with a drop of loctite at some point, or get a piece of dry ice and try to chill the dovetail selectively.
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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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