For those that advise scraping the chamber with a flared/sharpened magnum shell.......
Doesn't that just move the crud ring up a couple of millimeters? Won't the crude ring just continue to build in the forcing cone part of the cylinder? Guess the bullets will blast it out before it could ever inhibit a bullet, but still... doesn't the crud ring still grow and solidify - just a little further up?
I just cleaned mine out for the first time (only about 300 rounds through the gun) with a .45 brush and drill.... works pretty good, but still a wicked pain. Many times back and forth with solvent, drill, cleaning patch.
Really love shooting my .357, but I think I'll be going back to my semi-auto more just because it's easier to clean.
(One last thought on the Mag casing to scrap... how about punching the primer out and putting a nut/bolt through the hole. Then using pliers or vice grips on the bolt, you can more accurately control your scraping against one side of the chamber wall at a time.)