I think I remember that the original question was without power tools. Yeah, boy, you can use a 10hp gas powered grinder if that's what you want to do. I prefere to clamp the barrel in my lead-jawed vise, turn on some music, put on the optivisors, get a wood dowel & some fine grit wet/dry paper...you know the drill! I'm not in a rush, I'm not going to heat up the metal, the tool is not going to get away from me, and the results will please me and so far, my customers.
Again, I agree with Mete, you need to remove the transverse machining marks. I like to bring it to a high polish, and again Mete is right, just for show. Never had a customer to run his thumb along the feed ramp and ask if that was smooth enough!
And when someone asks advice and stipulates "without power tools", I'll first try to give 'em a workable solution the way they asked. Using the Dremel is a two step process, first learn to use the Dremel, then learn to polish a feed ramp. You guys using felt wheels are doing it right, but I've seen a few feed ramps polished with rubber abrasive wheels that, IMHO, simply made the problem worse.
J.Rhines
Seneca, MD