Wow!
Never seen one of those Lancaster, you certainly can find the rare & unusual ones!
Sort of like a Martini isn't it, no wonder they had the cleaning rod to knock the cases out!
Looks in pretty good nick really, glad you fixed the handguard, more so looks the part.
Have to ask, how did you find a piece like that, get Louis on the trail!
I suppose a lead projectile would be best in this old girl, a bit more work for you mate to figure it out completely.