I've loaded and shot my 45-70 Rem. rolling block with both Swiss and Old Einsford. My results are indinistinctule between the two. Further data is needed to make a reliable judgement, but in my case with my rifle I'd have to say that price would be the determining factor in my choice. Since I have a good supply of Swiss 1½ Fg, I'll be loading that for the coming season. But, when I make my next bulk buy, I'm thinkn' some OE will be included. FWIW, Buffalo Arms will mix powders to make up a full 25 lb. order.
DD-MDA