RE: Cleaning solvents and lube
For powder fouling I like using a mixture of 75% Shooter's Choice and 25% Kroil. MPro-7 works very well too. For copper foulingmy new favorite is Montana Extreme 50 BMG. It's stong stuff, the 50 BMG that is, so use it in a well ventilated area. Wipeout works pretty good too, but requires soaking for several hours.
Some other tips:
Use a bore guide
Use a quality rod like Dewey or Boretech.
100% cotton flannel patches are much better than the synthetic type
Do no use stainless steel brushes