ORIGINAL: roundball
Switch to real Goex blackpowder
Or better yet, make that CVA into a door prop, get yourself a Savage and shoot TRUE smokeless powder. After all, smokeless is the original and best BP substitute. All the benefits everyone is trying to achieve with the not-quite-smokeless subs, without the obvious drawbacks (crud rings, siezed breachplugs, corrosion etc...)
With all the problems associated with T7 and the like, I'm amazed people don't just go back to real black powder.
Mike