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Feb 9, 2017 · 50 caliber round (12.7mm), so we're not really talking about a small bullet. A round's effectiveness isn't just dependent on its size, however; ...
This article lists firearm cartridges which have a bullet in the 12-millimeter (0.47 in) to 13-millimeter (0.51 in) caliber range.
This article lists firearm cartridges which have a bullet in the 12 mm (.472 in) caliber range. Length refers to the cartridge case length.
... 12mm bore. 12mm converts to .47 inches and I have never heard of a 47 caliber either. I tried a couple different bullets just as a crewed bore gage and ...