68-Pounder Lancaster gun
Encyclopedia
68-Pounder Lancaster guns were a rifled muzzle-loading cannon that fired a 68 pound shell. They were fitted in pairs to the Arrow-class gunvessel
Arrow class gunvessel
The Arrow class comprised six second-class screw-driven vessels built as despatch vessels for the Royal Navy in 1854, mounting 6 guns. In 1856 they were redesignated as second-class gunvessels.-Design:...

. The cannon was designed with an oval bore and had a range of about 6500 yards. The gun suffered from a tendency to burst.
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