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Above is correct for rifles, shotguns and pistols, with the exception of revolvers.
Weapons should be cocked, so firing pin does not protrude, rod should be close to bore diameter, so you are not measuring an angled line thru the barrel.
With revolvers, open the cylinder, place a flat object across the forcing cone, THEN insert rod, mark, withdraw and measure.
Weapons should be cocked, so firing pin does not protrude, rod should be close to bore diameter, so you are not measuring an angled line thru the barrel.
With revolvers, open the cylinder, place a flat object across the forcing cone, THEN insert rod, mark, withdraw and measure.
