Thats a decent looking shooter. Looks like countless Birmy guns of the same time period. Id address the looseness after having the barrels checked out. Interesting the right barrel was cylinder when new and only the left barrel shows choke marking. Earlier guns would have not for ball instead of choke markings.

Enjoy. Oh yeah, you just clearly established its value to my way of thinking. Find or load a decent supply of proper loads ad you will be set for fun.