That is a cracking fine gun; remarkably similar to mine, but mine's not in nearly as nice condition, nor is it cased, much less with accessories. However, mechanically mine is sound and the bores are intact, making it a shooter.

I'm more than a little interested to see the results of your shooting: mine regulated with round balls, and grouped 4-5" at 50; shot patterns not worth a damn; had a few sample fosberry bullets, but could not get them anywhere close to regulating; perhaps I need to get a mould and play some more with those, as you are clearly having some success with them, and with a matching mould, clearly the gun was made to use such bullets.

Fine work, with a fine gun!