I remember when old Jack started fooling with H4831. It was called "4350 data powder" as one could use IMR 4350 data and not get into trouble.
It was WWII military surplus powder. It was used in the 20mm ammunition. The story goes that old man Hodgdon bought it as it lay in piles on the runways of old air bases. He had it washed, blended and packaged. It sold very cheaply and was loved by the long range target shooter of that era. E
