1 F
Your probably gonna use about 2-4 oz. of powder for eack shot.
If your just shootin' blanks, try a scoop of sand over the powder if it's a short muzzel. You can get a better sound by doing that.
For demonstratrions, if you angle your shots into valleys and such, you bounce the sound. I think 20 car alarms going off is the record. However in California this rule does not apply, due to the abundance of these animals.
Watch shootin' golf balls... They unravel... But, they make a really cool sound when the cover comes off.
A morter round can be made with a split tennis ball and a tin-foil charge inside. About a 6-8 in. fuse works. When the tenis ball hits. There is a delay and a nice POP.
AHH... You know this is all theory, right...