What ever primer(s) you happen to have will work.
When I was still shooting quite a lot of BP Substitute in shotshells,,I found that the Remington black promo hull (Gun Club??) won't melt when using them.
At least they didn't then,,maybe they've changed plastics since.
Any other plastic shotshell hull I tried melted and made a mess including the Remington Green plastic hulls.
I never tried it with real BP to see if it can stand up to it and not melt when fired with it, but it may be worth a few rounds to see.
They are usually for the picking around the skeet and clays courses.
They would take 3 or 4 loadings before the inside of the mouth of the case was just burnt and charred for lack of a better description and I'd pitch 'em at that point.
Federal paper cases would last 2 loadings usually before pin-holes would appear just above the brass.
Then I ran out of Federal paper cases anyway and looked for cheap substitute and found the Remington case.
I never found a plastic wad that wouldn't melt using one of the sub BPs. It was always card and fiber wads. I'd find them at gunshows usually. Old stocks of Federal and Winchester for the most part and generally cheap.
