Thanks Ken, appreciate the advice. I guess barrels are now threaded into the frame? Would this gun be built during the time frame when there were issues with the barrels working their way loose?
All barrels are threaded into the frame but they used a looser fit long ago so they pinned them. They were more accurate. The crush fit can squeeze the barrel and make it smaller at the threads. Power lapping is the only way to correct it.
I have heard of S&W .460's dropping the barrels on the ground. I have no idea what they did with this gun?????
It would seem that if they reversed the twist so a barrel would stay tight, it would solve the problem.