A year or so ago I bought an old military surplus rifle that had been sporterized. Previous owner had shortened the original barrel and done a so called bubba job recrowning the muzzle. I'd taken the rifle to range a few times and its accuracy was rather poor and I blamed its inaccuracy on the bubba crown job. Curious how bad, uneven the crown was, I took my Lee reloading tool for hand trimming brass and with the best fitting spindle on it, I inserted it in the bore. Of course the spindle was loose in the barrel. So I used a piece of aluminum cut from side of a beer can, wrapped it around the spindle and reinserted it in the muzzle. Nice tight fit and the aluminum protected the rifleings. All I really wanted to do was to lightly twist the case trimmer and check for how level the crown had been cut. It worked, I could now see the scratches from the trimmer's 4 cutting edges, easily revealing the uneveness of the homemade crown. Knowing the steel in the Lee trimmer tool to be a lot harder than the metal in the barrel, I decided see if I could use the Lee tool to recrown the barrel by hand turning it with a steady pressure. About 15 minutes later, I had a pretty nice looking flat crown. Then I took a carriage head bolt, coated it with a fine valve grinding compound, put it in my electric drill and lapped the edge of the muzzle bore. Took rifle to range and discovered the accuracy of the rifle had improved considerably.
Shortly after this, I mentioned my use of the Lee case trimmer to recrown a muzzle in the chat room of Surplus Rifle . Com, showing them some pics I'd posted on Photobucket of my experiement. Guys in chat room thought it was neat and they suggested that I post it in the gunsmithing forum of Surplus Rifle, which I did with pics included. My idea of using the Lee Case Trimmer to recrown a muzzle was warmly received, tried successfully by others, and soon my post was made a sticky at the top of the gunsmithing section. Of course, a gunsmith took exception to using a $8 or less Lee case trimmer to crown a barrel that he charged $75 dollars for doing. LOL, can't blame the gunsmith for that.
Anyway, this morning I just used my Lee Case trimmer on a M1917 30-06 sporter crown that needed some work. This is my 4th time to use a Lee case trimmer to recrown a barrel and like my first three times, I expect the rifle to shoot more accurately. Just thought I'd share this recrowning method to you.