[ I'm not sure what match grade .22 short actually means ]
A "match grade" chamber usually means that the chamber is tight, or minimum size - and still fall within the standards for the cartridge.
A "match grade" barrel is generally taken to mean that extra care was taken during it's manufacture, boring and rifling, and that both the bore and groove diameters are to minumum spec for .22 RF, and the rifling twist different per the cartridge application, due to different bullet weights between Shorts & LR's, etc.
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