I agree. If you have a good cleaning rod that is one piece, preferably steel, and are willing to sacrifice a bronze brush( your used one will do), put the end of the rod in a hand drill( electric), and wrat the bronze brush with 0000 steel wool. It should take some effort to push in down the barrel. Turn the drill on and got to polishing. You will have to change the steel wool freqnently as it works its way down into the wire points. or just breaks off. The wteel wool has some oils in it, so down worry about lubricating it. It will polish off the rust quickly, but you want to take out tool marks. Depending on how bad they are, you may be able to take most of them down with many uses of the steel wool. Otherwise, you may have to invest in some honing stones, mounted on springs. Your auto supply store can set you up with these as cheap as any of the gunsmithing supply houses. Check the discount houses on the net, too for bargains.
When you get all the tool marks out that you think you will, use either jeweler's rouge, or JB bore cleaner on a tight patch or double patch, and polish the surfaces even finer. When ou are donw, give it a bath in cheap alcohol, to get out all the debris. You should find that loading the gun is much easier, and the barrel should also shoot more consistently. Use a chronograph before and after to measure the improvements. YOur cleaning patches will tell you the difference after you have done the polishing.
I have a rifled gun that was always dirty to clean, until I had the bore chrome plated. It still takes some lead residue, but it cleans out with one patch, and the lead no longer seems to build up. Homer Dangler had a barrel he was using to build a gun chromed on the inside. He did not find it made the gun any more accurate, but it surely made cleaning a snap. Knowing Mr. Dangler, I suspect that was heck of an accurate barrel to start.