you can’t really get a mirror-like finish in any metal in barrel
polisher. the finish tends to be shiny but very slightly pitted. the
problem you’re going to have with barrelling steel is the work is
going to be fairly hard. considering the barrelling media is
s.steel, i don’t think you’ll make much progress. now, if you could
get some ball bearings or other media made from tungsten carbide then
you could be in business.