For true, you should get some books, among them "The Gunsmith of Grenville County," in which there is an excellent description of how to make a ramrod channel. I tried the special tool by Track, ( long drill- like gadget) and had dreadful results: a bunch of chip out which will make huge inlays unavoidable. That particular rifle isn't even within a day's hike of PC, so I'm not too terribly upset about it, but it is more work- chalk it up to skill building, i guess. IMO, the scraper made of an old file is the best way to go- it allows a good deal of control, and it forces you to 'sneak up on it,' a habit which is hard to break in our instant gratification, power tool oriented mindset.
best of luck, go slow, remember that it's here for fun, so there's no hurry.
MSW