Early tests look good. My barrel mikes .370 so I paper patched some 158gr .357 cast Keith type bullets. Two wraps of damp computer paper gave me .372, after the patches dried, I seated some Win large rifle primers in Norma cased and loaded 10 grains of IMR 4759 and placed a 1.00" square piece of toilet tissue on top of the powder with a pencil to hold the powder in place. Then seated the patched bullets until just the top edge of the patch was visible, at 15 yards both barrels centered the bottom of a pop can, off hand, I'm impressed. As usual take care in loading this in you gun and I will not resume any responsibility if it doesn't work or causes problems.
Bob