Both the 10mm Auto and 45 ACP were born out of a desire for a more powerful pistol cartridge. Here's what to know about the 10mm vs 45 ACP.
10mm vs 45 ACP Field & Stream
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Ballistics Showdown: Comparing the Power of 10MM vs 45 ACP
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45 ACP vs. 10mm: Each Has Its Own Advantages - Wide Open Spaces