Specific jags I can't help you with, I'm not particular.
SOMETIMES the 20-22- cals are a little large, you may need to do 20 only.
Personally(call me crazy if you wish) I would use WD-40 over Hoppe's #9.
Honestly my 2 204's really never had ANY copper issues. They(specifically the sub-22 cals) have a common problem called(by Sierra) hard carbon. Any sort of powder solvent and a bore snake REALLY does wonders to keep it at bay. Then do your serious cleaning when you wish. Once it starts it can be a REAL bear to deal with IME.
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