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Shotguns are generally considered small arms:

10 Ga = 19.69mm

12 Ga = 18.53mm

16 Ga = 16.83mm

20 Ga = 15.63mm


And a lot of black power rifles were considerably over .50 cal:

Brown Bess (4.3m built) was .75 cal

Springfield Pattern 1795 (150k built) was .69 cal

Dreyse Needle Gun (1.15m built) was .61 cal

Pattern 1851 Minié was .70 cal

Only around the ACW do you start to get calibre dropping below .60, and initially not by much.


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