Now that I've got my lathe, I have the cutting and re-crowning of barrels sorted. I cut the barrel with a small angle grinder using a thin grinding wheel. This is a very quick way and allows little heat build-up. Then I put the barrel in the lathe to true-up the muzzle. While it is turning in the lathe I twirl a 6mm ball-headed mini cutter held in vice grips around in the bore. This method really gives a nice even crown. Then I finish it off with a rubber polishing tip just to remove any burrs. Finally a bit of bluing and you're done.