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By swabbing more often... perhaps every 2nd shot like most of us do! All you need is a small, empty spray bottle & fill it 50-50 with Windex & rubbing alcohol... works marvelous for cutting fouling & carbon.

You will also need to discard the almost-assured weak "Blackpowder Cleaner Solvent" you are probably using (T/C-13 & others) & purchase a solvent that removes plastic. It will say-so on the label. If you are shooting copper-clad bullets, you'll need a solvent that removes copper.

Failure to do so will eventually result in declining accuracy... sometimes rapidly.... like overnite!