Superformance powder is horrible, very inconsistent from shot to shot. I too bought a couple of pounds and it has since been used as paper weight. If your looking for a good powder look to 8208 for lighter bullets and something like either IMR4350,H4350 or RL 17 for heavier bullets in the 22-250AI. Im sure there other powders as well that will work just fine, just dont use the Superformance because it Supersucks.
Mr. O