HEAD0001
I have two GM-LRH barrels that I bought several years ago from GM. They were 32" barrels on sale - so when I got them I took them to my local gun smith to get them cut back to 28." He asked if I wanted a false muzzle for easier loading and alignment. Never heard of it at the time but he showed me several really old ML's that had what he was talking about - so I said go ahead.
Both of those barrels shoot conicals great and my hunting partners newer 54 cal TC Hawkin with a TC-QLA - it shoots conicals just very well, actually I shoud say he shoots it very well, but in the same paragraph I should also say that TC did have a proble with QLA's on some of their inlines.
If the QLA is cut in centered on the bore it will work fine if it is off a little bit it will cause the bullet to drift as if the crown was damaged.