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In the US, or everywhere?
In the US it's 22LR, .223, 308, and 7.62x39 in the rifle calibers. In pistol calibers 9mm and 45 ACP are the most popular with civilians, 40 SW with police.
Worldwide 22LR, 7.62x39, 5.56x45, and 7.62x51 are probably the most popular in the rifle calibers. 9mm is likely the most popular pistol caliber.
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