Bob Hutton was a bit strange. Iirc, he also coined the term "UMAGGBEE" for about twenty grains of 2400 in any non magnum case above .22 diameter.
"Universal, makes any gun go bang." He proposed it as something that didn't really exist in principle at the time, a post-apocalypse asset. A keg of 2400 could load almost any rifle or pistol, and you could even do it by just taping a few labels on the keg that could load just about any round in the planet based on bullet weight, diameter, and case capacity.
The funny thing is that all of the loading data of the time pretty much supported it. The rounds would be terribly inefficient in some cases, but if it's a matter of roasted raccoon or pine bark for dinner, killing the coon will be more important than the powder used.