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444, RickD seems to have pretty good phrasing in his post...
My shim seems merely to act as a damper, reducing the amplitude of the vibrations. I guess. Dunno. All I know is that regardless of barrel length or bullet weight, groups shrink.
As far as stock warpage, me being such a cheapskate and all, if the clearance to the sides of the barrel is at least 1/16" and the clearance below is a bit more, sealing the wood with stock wax or expoxy varnish holds down any change in moisture.
If slight moisture changes from local humidity make a stock warp more than 1/16", there is some problem inherent in the piece of wood of which the stock is made. Decent wood just won't do this much changing.
Art
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