Dave I haven't played a lot with that bullet, although I recently cast up another batch in 20:1. I patched them to just under bore diameter with 8lb Seth Cole. I don't remember whether I was using 0.060" LDPE wads or a lube cookie between veg king wads as I'm not at home with my notes. The powder charge was 82gr of Goex FFg Express and it shot just over 1 moa high ( and a greater amount of horizontal though ) at 200m. The rifle is a CSA 1874 chambered with DanT's .45-70 paper patch reamer, and an MVA 6x scope.
I've got to play with this setup a bit more as I'm thinking of using it for scoped silhouette next year.