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Is there a 12mm bullet?
Is 12 mm a 50 cal?
What is the largest legal bullet size?
How big is a 12.7 mm bullet?
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.