This is what happens when I get bored and go to the gun show lol! Picked up this beat up IJ project. After an hour of google-fu it appears to be a deeper rabbit hole than I thought. With 2 pins in the main frame I think this is an old model black powder unit. I'm loading Mo Cast 145g RN over 2.5g HP38 for my S&W Victory, but think that might be a little stout for this old dog. You think backing off to 2g might be ok? I only have HP38 so no other powder need apply.
It looks plenty rough but has strong rifling left in the frosted bore, and locks the cyl. up nice and tight. The project part is the trigger won't return, so probably needs whatever spring that is.