I recently installed a new Criterion .30-06 barrel on an M1 Garand. I finish reamed the chamber with a front turned headspacing reamer which I rented from an on-line source. I noticed that I had to use a fair amount of pressure to get the reamer to cut. during the reaming process, I removed the reamer and cleaned the chamber with solvent and a cleaning rod several times. The finished chamber is somewhat scratchy even though I used a good quality reamer cutting oil. My question is: what's a good way to polish the chamber. It's not like the scratches are really deep. I was thinking of running a cleaning rod down the barrel and wrapping something like 280 or 320 grit emery cloth around a 35 caliber brush and turning it with a drill for about a minute or so, nothing excessive. Sound good? I suspect part of the problem stems from the reamer being dull.