I bought two cases (50# same lot#) of Swiss 1-1/2 to load in my Browning .40/65 B.P.C.R. with 59.0 Gr. and a 400 Gr. bullet. I have shot this load for a while, and it seemed very accurate. The new powder however has a lot more "loft" and it fills the case about 1/2" higher and requires more compression. The new powder causes far more fouling even though I swab after every shot. I tend to believe my accuracy falls off the further down the string. I plan to reduce my charge to 58.0 grains to make sure all the powder is getting burned but am looking for educated opinions.