Triple 7 is still the best thing on the market for sidelocks. In my cap and ball revolver I have 2 full weeks without cleaning it to see how corrosive it was. After two weeks, I got tired of looking at it each day. Cleaned up fine.

Inlines (with a certain type of breechplug) though are a different story. "Blackhorn 209" is now top dog. It's very expensive but it is non-corrosive.