Ok, as long as I have this thread going another possible problem. The bore on this mortar is 1.69 inches. A golf ball rolls in easily now but fouling is bound to be an issue. The maker says he use to make them 1.72" but his competition shooters wanted 1.69 and has built them like that ever since. With the trunnions in place opening this up on a lathe would be problematic I would guess. I could shoot 1.67 zinc and that would help some or I could use a cylinder hone to open it up a few thousandths. Maybe I'm over thinking this, what say you?
“I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them.”
― John Wayne "The Shootist"