Very interesting, Brithunter.

Australia's most famous deerhunter, Arthur Bentley, used something like that to hunt sambar for many years. I think his was sporterised here and he has carved a deer into the butt-stock.

Your rifling would be a challenge to clean. I don't suppose it is the original barrel. Breech-loading military arms with full wood were sometimes designated 'muskets', though the spelling on yours suggests the maker was in the grip of the grape.

- Paul