Smitty.........no need to trim the muzzles on those barrels you mentioned, they are not made the same way Douglas barrels were made. I used a Douglas, 7/8" 45 cal. barrel on my first rifle. I trimmed some off the muzzle, I think it was
only about 1/8", mainly because the corners of all the flats were rounded off, and unless I am mistaken, it had the cal. and twist stamped on the muzzle end. I also crowned the barrel with a needle file, each land and groove.....barrel shot
great.....so much for having that perfect muzzle............Don