Observations from field testing today:
Old paper win hulls are rubbish: leaky primer pockets, and pinhole failures at the junction of paper and brass.
Yellow rems (peeled heads; will try resizing soon) are good; I'd anticipate a couple more firings from them, even using BP, which normally destroys a hull in one shot. Peeled heads seem to seat very deeply though; had one misfire.
My 21mm wads (card : 2 x 1/4" cork : card) seemed to give a good gas seal in my ctgs and .815" bore.