Here's another clue:
"With only 1.4 grains of case capacity to work with, John concocted a blend of Alliant Blue Dot and hydrazine but, unfortunately, the compound caused it to rain whenever it was tested in the lab. Eventually the Blue Dot was discarded, the hydrazine was discarded and velocities of 1,200 fps for a 28 grain FMJ bullet and 1,400 fps for a 20 grain hollow point bullet load were attained with a small rifle magnum primer and one medium size pop rock."
It is good for a laugh or two.
DM