The old boys I shoot with claim the only way you can get a full load of black powder in the case is to use the old balloon head cases. I don't see a problem using the balloon head case as long as your using black but have heard you can run into problems with smokeless, I guess if Elmer was still around he could testify as such. Those cases are pretty cool anyway. I shoot BPC in 45-70 and 45-90 and was wondering how they got 70 grns in the case, one of the old boys said that they were balloon head cases. Winchester cases are the thinnest, allowing the most powder but I still struggle to get 70 grns in. Swiss formula works a bit better, I am using that in the 45-90 and have plenty of room for more powder although am finding it unnecessary, 75 grns seems to give me excellent accuracy with room to spare, that is 1-1/2F.