I have been shooting a .40 Cal. Browning using 59.0 Gr. of Swiss 1-1/2 with a 400-gr. bullet. A couple of months ago I purchased two cases (50#) of 1-1/2 Swiss, both of the same lot #. I found with the new powder the "loft" in the cases to be considerably higher, but I shot the same load. At first the accuracy remained about the same, but fouling was terrible. I am getting twice the amount of residue on my patch when I swab after the shot and I think I am losing accuracy as the string goes longer. I am going to reduce my charge to 58.0 gr. to see if I just have too much unburned powder. Could it be my powder and if it is, any suggestions?