Malamute,
Have you tried #1 buckshot? That is .30 cal also. A Navy buddy years ago told me about using these in .30-06 for squib loads. I never tried it, though it is intriguing. He claimed to use a very small charge of Bullseye, add tissue paper for filler. Spread the buckshot in a cake pan, pour melted wax over it. When the wax has cooled, invert the charged cases and cookie-cutter the balls out.
-WH-