As said, not always best to replicate the experiment. Certainly not without regard of ones surroundings!
I like putting the cordite strands end to end, and light one end. Gives a marvellous 'Gun powder trail' effect, like in the cartoons! (All done in a serious and controlled manner, of course!).
This is a photograph I took recently, to show how vigorous Cordite burns. These strands were from a .303 cartridge in a similar condition to yours, dated 1941. This is an entire cartridge load going up, after 75+ years in the elements.
It went up PERFECTLY, with the flame column about 9 inches high. Just goes to show that this stuff is
never ever 'deactivated by time'!
Regards,
Simon