Being a frugal bugger (some might mistake for cheap) I made up a few steel bases for 10 guage shells that allow me to reform them into 8 guage. The steel part is 8 guage on the outside and about 3/4" long and after an empty 10 g plastic shell is put in it, I take a metal expander heated in boiling water to stretch the body of the shell to 8 guage dimensions.
I had some paper kiln gun shells but they only last about 2 or 3 shots before powder is leaking out between the brass and the paper. If ever I get some spare time, I intend to make up enough steel bases to shoot a round of skeet with the gun.
cheers Doug