I'm just putting the final touches on my mountain howitzer.  I started it mainly as a large noise maker but I have to admit to a temptation to knock something over with a steel ball or whatever is handy  The carriage is the pack type and the barrel is a 2.25" from Hern.  I should have the tires on the rims next week and then it is "Look out, Betty!"  However, before I pierce a charge, I would appreciate some advice from experienced hands on suitable loads for both noise and more serious stuff, plus construction of a practical sponge.  I've mined this site and Buckstix quite a bit and have seen or shot smaller charges with salt and flour on top but don't see anything but disadvantage.  Any help?
Fred