This cannon is a reproduction of a 3" rifled cannon that was introduced in 1865 & used at Fort Stevenson. This cannon  shoots a 7" 10 pound conical projectile. When fully charges with 2 pounds of gunpower, it could shoot a target 3 miles away.

3" Ordinance Rifled Cannon 

Fort Stevenson State Park

Garrison, ND

            

North Dakota Military Vehicle Collectors Association

3 inch Ordinance Rifled Cannon