I have a question about rust bluing.I have reblued about half a dozen double barrels so far and have had good results.I have used brownells classic rust blue.I like it it.I get a nice deep black color with a mat finish.I polish the barrels to a 400 grit.My question is how do i get a more shinny finish.I have seen some barrels that have a more of a gloss finish.not a hot blue finish.That is easy to spot.I am talking about a rust bluing.Does the brand of rust bluing matter,and should i take my polish to a higher grit.