Hehehehe... I hope you still have your letters from Jack... I would TREASURE such a thing, but was not smart enough to write him back then... I DO, however, have handwritten letters from Bob Hagel and Finn Aagaard, which I'll keep forever..
Basically, Jack ( and others) put as much of Bruce Hodgden's surplus 4831 in a .270 case as they could fit, tapping the case on the bench to compress it, and then CRUNCHED a bullet down on top of it..
I do not endorse this practice with modern powders...yada, yada, etc. etc.