You gotta look at the design of the Hoppe's Tornado. It is not a brush per se. States it is designed to clean fouling, but I can see where it may have a smoothing/ polishing effect.
I have about 5 different types of ammo to try next from the SW recco to match grade. My preferred range has been closed a lot due to weather and I have been on pistol projects so the 10 has been sitting. Going to try some before and after attempts if possible and nothing else works out.
I am not going to retro engineer the thing, it is just not worth it for a modular disposable gun. I am not gonna flog a dead horse, but I will gife a horse a little massage and love. Possibly I have not found the right combo, but at this cost I coulda already got two straight shooting bolt guns or a sweet M1A.
I agree with you on the bolt gun part. Be cautious on the M1A looking for accuracy as you may have to do some work to get there. I know about that from personal experience.