"Jingal was the name the British gave to both Indian and Chinese rampart guns used from the 1700s up until World War II. The guns were originally muzzle loaders, used in fixed defensive emplacements. They had exceptionally long barrels (60″ or more), and were used to fire off rampart walls as a sort of precision artillery. The very long sight radius gave them better practical accuracy than smaller shoulder rifles, and the large calibers used were effective at long range. The massive size of these pieces is hard to describe:
Jingal Bolt Action Wall Gun in either .60 or .75 Cal.
Interesting!
Wouldn’t the friction of that long barrel reduce muzzle velocity dramatically?
Sorry, the first two images are called "Punt Guns" and were large bore shotguns designed for commercial duck hunting. In normal use they were mounted to the prow of a rowboat called a punt boat.
https://rarehistoricalphotos.com/punt-gun-1910-1920/