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If you are talking about a .45 acp The bullet diameter of .451 equates to 11.5mm. If you are talking about a bullet used in rifle calibers (45-70) etc.then the bullet diameter of .457 equates to 11.7mm.

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Q: What is the diameter in mm of a 45 caliper bullet?
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What mm is the ammo for 45cal?

11.5 mm bullet diameter


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