Most foreign and some American commercial cartridges are identified by their nominal bullet diameter and cartridge case length, both of which are given in millimeters-e.g., 8×57, 7×57, 6.5x54mm.
DESIGNATION – METRIC CARTRIDGE
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Most foreign and some American commercial cartridges are identified by their nominal bullet diameter and cartridge case length, both of which are given in millimeters-e.g., 8×57, 7×57, 6.5x54mm.