skip, Take a 4 inch piece of 3/8" dowel rod, cut a one inch long slit in the end 1/8" wide and put a small piece of #0000 steel wool in it and polish the throats out in a variable speed 3/8 electric drill on about 1/3 speed. That will polish out most or all of those reamer marks "without" taking any more metal out! It's just another way to "burnish" those cylinders. As a long time gunsmith, I have done this hundreds of times and have yet to "harm" a cylinder!...............................Dick :idea: