My question, Oldstarfire, is what is the wall thickness of the liner just in front of the false chamber insert? And what is the pressure of a .32-40 at that point?
Liner OD is .5625, bore is .323, wall about .110
Pressure? Don't know, cant hold my finger over the muzzle tight enough to feel (Joke).
I am shooting a 160 cast with 7 gr Trail Boss, seems very mild.
I did similar with a 38-55 in a 20 ga with no problem, later epoxied the liner into place as I did not like the accuracy. Found the problem was actually a bad crown.
