What to use as resistance on short barrel gb mortar

[bluez]

I have a short barrel golf mortar, the inside barrel length is 2 x the caliber (two times the length of a golf ball) There is no sub-chamber. The mortar is very solid, and  gives a very nice report when firing a golf ball. When i want to shoot blanks i have a problem, and that is what to use in front of the powder (FF). In my longer barrel cannon, only a little paper is enough, that's not the case with the mortar. I have tried grass, and solid paper it doesn't work. I have been thinking and casting wax bullets but i would prefer to this as safe as possible. Any ideas?

[Double D]

Since the is no sub chamber  make a cartridge out of foil.  Here is a link that discusses how to make a cartridge Loading Cannon Cartridges

You can also cut a flat disc of cardboard that is snug fitting for the bore and push it down on top of the cartridge.  

There is a  limit to how much noise these small guns make.  If you want noise get a thunder mug.

[Asron87]

That's a pretty sweet GB cannon. Where did you get it?

I think someone on here had put flour on top of the BP, something you might want to look into.

[Parrott-Cannon]

I use a solid practice golfball for a blank - it gives a good report and has a very low mass.  They do not go fare and are soft - I get them at Acadamy Sports.

[bluez]

That's a pretty sweet GB cannon. Where did you get it?

A friend of mine runs a mashine shop and has a cylindrical grinding machine. I designed and he made it. He has also made a 1" cannon for me.

[nchokie]

I use fresh bread .It packs nicely and the birds love it!!

[GGaskill]

The trunnion looks awful small to me.  Probably should stick to blanks and real golf balls.