I've had a couple pounds of HV !00 for a while which I bought at a good price but never worked with it until recently. It did produce excellent accuracy at a grain or so above IMR 4350 loads albeit at the magic 2600 + fps range in the .30-06. I would be cautious trying to achieve high velocity with it by way of adding powder. The load I used in the 30-06 was 54 grains with the Speer FB Mag tip 180 grain, < 1/2 MOA. c/c, 56 grains = 2700 fps & 0ne MOA.