Good data in this thread. Since I started using a bore scope, I have learned a lot. Hog-P is right, you don't know that your rifle is truly clean until you scope it......but having said that, if it shoots to your satisfaction, then I guess you don't need to know more. But for older or rougher bores when shooting monometal, it may not be possible to fully clean them without using some mechanical means........not just chemical.....say JB bore paste or the like. It can be a necessary step for my older guns. Also, it is very possible to get a rifle too clean.....like over cleaning a dutch oven.......they often shoot better when the pores are sealed. If you need a two inch group, you don't need to know much about cleaning......if you need a half inch group, you had better have a good method for cleaning thoroughly.........for a properly broken in Hart Bbl it is easy, they are smooth and clean up nicely, for a 60 year old workhorse........cleaning is hard work, takes many (at least 7) steps, (and I hate it!!)..............thanks for posting...........FWB
I've bought a lot of nice guns over the years deemed "discounted" with bad barrels or innacuracy. Maybe I'm lucky, but I've never owned a ruined bore gun. Inevitably, 90% of them are just filthy and need a 1-month gentle cleaning regimen to remove caked layers of brass-lead-copper-steel-rust-powder-carbon cycled in various layers like a pearl on the barrel. Each chemical removing one later only to expose a different compound in the next layer. I've had 3-5 MOA 125 year old guns become 1MOA guns with this treatment. Failing all of this, I find its throat erosion and that loading closer to the lands without violating CIP specs usually "fixes" ruined guns.
To simplify: elbow grease is cheap and cures most ills