When using the AlOX you must scrub the blasted portion down with 1200grit wet-r-dry and kerosene/WD40 or the like to knock it into shape but a 70 grit finish can be scrubbed down quite quickly, the tops are knocked off, rounded off in minutes. Don't be gentle.... if you go too far just give it another squirt of sand and knock 'er back again...
I'm not sure that the newer Rem700 "stainless" action doesn't have some sort of gas carburized finish or something. It ain't raw "stainless" IMO. I haven't dared blast the action on a new one.