You can get rolls of emery cloth in various grits....probably at an auto parts store or hardware store. I think that would help in rounding off your edges.....use a fairly long strip and hold it at the ends. When you go to re-blue you might try Dichropan T-4 from Brownells. I recently re-did one side of my .45 slide that had some minor pitting....I used emery cloth, then a buffing wheel, which left me with clean, smooth white metal. I used the Dichropan and it turned out really well.
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