[Insert cheap/easy joke here, i.e. "Hotly"] What I mean is, how does the combustion travel through the propellant. Does it work it's way from the bottom to the top (makes a LITTLE sense...as this would mean the ejection charge gets ignited last)? Does the whole middle 'core' (around the hole/c-slot) ignite at once & propogate outwards? And, god forbid, has anyone ever seen an animated/illustrated graphic that kinda shows what happens? Thanks!