I have loaded many thousands of black powder Trap loads in Federal Top Gun plastic cases. Many of our club members do the same.
We use fibre wads because plastic wads leave stringy plastic in the bore, but the hulls cause no problems for a single use and then discard them.
I use a brass measure for powder dispensing, but other operations are done on a single stage press.
Black powder Trap gets expensive at 80 grains of FFg per shot.