Daryl-

Thanks for your comments.
Those little cup-shaped OP cards are indeed great.
They go in the cases directly on the powder, with the open cup feature facing the powder. They hold together very well.
I haven't tried any commercial OP cards of any type, as the milk carton material has always worked for me. I hadn't ever wanted to pay for them or to have to wait for shipping - especially as the virtually free carton stock was already on hand and worked so well.

I'll give the vaseline/beeswax a try some time. The felt wads you see there are circle fly brand 20b wads that I had shipped with my Pedersoli Howdah pistol some time last year. I've run my own hand made felt wads and these - note though that the donut shaped one was cut here, I don't think circle fly offers donut wads. As a note, ballistic products is now offering half inch thick donut shaped felt wads in 12 bore size.
I called them and asked if they'd consider offering similar but in sixteen and twenty bore, but the youngster who answered the phone didn't seem to know what to say - too low on the food chain to speak to decisions of policy, and not interested in taking my request up the ladder.
T'hell with them if that's the way they handle requests. My lathe still works and I can put out any punch I need...

On the blackpowder substitute, I'm interested to see how it does in a pressure gun. The Swiss powder seems to work pretty well in this rifle. I'll be doing back to back tests between Swiss and Goex some time in the future with this one to see how it compares. I'm having the sense that Goex will do just as well.

Cheers
Tinker