Daryl,
My buddy, that loads pinfire ammo, uses centerfire primers. He inserts them, upside down into the primer pocket, so that the "pin"fits through the hole in the case and rests on the anvil of the primer. BTW, I think he makes his "pins" from the springs found on common clothes pins. He closes the hole at the primer pocket with tape. He uses black powder only in his old guns.
Mike