Hello '49
Your first post spoke of casting balls out of wheelweights is why I mentioned it......pretty hard alloy..

Also, if the bores were modified while it was in England then there would be marks indicating reproof. As in an “R” stamped on the barrel flats.
- Mike

EDIT:
I just reread the thread, and found one from 2012 on DoubleGun as well, and realised that this is a very light (I think) 10 bore chambered for quite short cases? Maybe a 4 Dram, max 5 Dram? If it is the same rifle.....
Less than 2 1/2” case length? Correct?

What was the reply from Greener?