Alsaqr - if you'd share your 3031 load data for 55-gr bullets, I'd love to see it. In my experiments with 3031, I found the ammo to be a somewhat smokey and a little less accurate at 100 yards than my usual loads with TAC and V-133. I'm using 20-inch 1/7 and 1/8 barrels, as well as 16-inch 1/7 barrel.
Just for fun, I'd like to experiment with 3031 some more, so your successful load data would provide a nice starting point.