H-570 was, for a long time, one of the preferred powders used by the 1,000 yard benchrest shooters at Williamsport, Pa. I can remember ads placed in the various shooting magazines by Earl Chronister, one of the top shooters of the day, practically begging for the stuff, and offering to pay a premium price for it.
There was nothing at all wrong with its performance.
Both it and H-870 were surplus powders, probably never to be seen again.
