Finally got a chance to try out my Dixie coehorn. The neighbors were suitably impressed. It sent the racquetball about 200 yds, with an altitude of about 100yds. And this was with only a film canister's worth of powder (about 3/4oz)! I can't imagine what the max charge of 4oz would do, but I think I'll stick with the film canister!
Pic is here if the attachment doesn't work:
http://www.io.com/~pogue/Kaboom.JPG
Pic is here if the attachment doesn't work:
http://www.io.com/~pogue/Kaboom.JPG