Bud , I'm with you. My total barrel cutoffs are many + . The one thing I modify my cutoff procedure with is the 4" belt sander using blue or green belts for metal. They don't wear out . Keep a square handy to check progress , and turn the barrel with fingers , while in contact w/ sander. Once the square says the barrel is perfect ,I use a one inch mounted stone to deepen the square muzzle crown , then I Have a crowning gadget I made 40 years ago. I found a barrel of different size ball bearings in a salvage store. Picked some likely sizes from 1 1/16" down to .280 to accommodate all calibers.. Glued the bearings into a pc of maple I can put on the floor. Add a smear of valve grinding compound , place the muzzle down on the bearing , rotate barrel between palms of hand and a pinch of 400 grit paper on the thumb or finger to remove any minute burrs , perfection. Since my old shoulders have become troublesome , I bought the most amazing tool ,a portable , battery powered hack saw. Love it................oldwood