Have you looked into Perfect Pattern powder? It is good for that size load and is available. It is a dense powder. You might need a 3/4 oz wad for it to stack up good.Finally found some 7/8 claybuster wads for my trap loads today; gonna run out of Xtralite powder before I shoot these up. Probably should find a new recipe for trap loads my arthritic shoulders can stand; gotta be one that uses powder I can find. Looking, too, for some Trailboss for my plinker loads in the leverguns; down to my last full pound of 4759.