Brownell's 'Double-Tuff' bore brushes are unbeatable.

Expensive, and you have to deal with the owners of Crow Wholesale who are the monopolists that destroyed Gamaliel Shooting Supply, but they are the only source.

I buy a dozen 12 gauge Double-Tuff brushes every few years and use them for smaller gauges as they wear.

It's the only way to go. Gets me to that after the shoot martini faster...

"The price of good shotgunnery is constant practice" - Fred Kimble