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I think i may have the first 500 mag in the
You can check the twist rate with a cleaning rod and patch on a tight fitting jag....run the patch into the bore just short of the throat, mark the rod at the muzzle, withdraw the rod from the bore so the mark makes one half turn allowing the rod to turn freely. Measure from the muzzle to the mark, double that for the twist rate. IIRC, the handguns have a rate of 1:15" or so.
Tim
You can check the twist rate with a cleaning rod and patch on a tight fitting jag....run the patch into the bore just short of the throat, mark the rod at the muzzle, withdraw the rod from the bore so the mark makes one half turn allowing the rod to turn freely. Measure from the muzzle to the mark, double that for the twist rate. IIRC, the handguns have a rate of 1:15" or so.
Tim