12g slugs in dikar sxs ml

[deadkelly]

i've been using patched 69 cal balls over 60gns of wano fff ,works real well.but it is very dry in the land of oz i don't want to start any fires from smoldering patchs,does anyone know of/wear to get slug moulds for black powder 12g?.
can i use plastic wads and commen slugs?
thanks.