I have tried everything and my 2 .45 bisley are still leading up. I'm at my wits End! One is a stainless 5.5" bbl and the other is a7.5" blued bbl. Cylinder. throats are reamed .4525 and forcing cones are recut at 11 deg. How hard is it to Taylor throating the barrels, or is it even advisable? Should this be done by a qualified smith? Fire lapping sort of maks me nervous too.