Tonight I was looking at the new .357 mag barrel I just got from NEF and thought I'd measure it to see what size pilot the reamer will use when I decide what to chamber it to. I tried gauge pins in the muzzle and was surprised to see a .351" slid in easily. OK, will it go all the way? Heck no! It stops halfway down, and dosen't go at all in the chamber end. A .350" went all the way. Man, tapered the wrong way! Aaaagh! Well, that's something to ponder. Do I care enough to try to lap it straight before rechambering? It'd be fun, but I don't know if one of these guns is worth the effort. Maybe just rechamber anyway and use loads with lots of cream 'o' wheat filler to try to seal the gas. Heck, I dunno - I'll do something fun with it.