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Depends on whether you use the weight of the projectile, or the range it can be fired. During WW I and WW II, the German Army built railroad guns that could fire a shell VERY long ranges- measured in miles. The largest guns in use today MAY be the US Navy 16 inch guns used on battleship- they fire a shell 16 inches WIDE- the shell weighs as much as 2,700 pounds, and has a range of 41,662 yards (about 39 kilometers). There have been other experimental guns under project HARP that were intended to fire a shell into earth orbit- but their status is uncertain.

See the link below for information on the Navy 16 inch guns. Of course, these are NOT hand held firearms.

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14y ago

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