It *IS* fun!!!! and you don't need primacord. I posted on my experiences with stump blasting here:
"Worlds fastest firewood splitter"
In some places around here I found it actually *can* be done legally. But you need liscensure, permits, etc etc...
I do all the blasting and pyrotechnics for a friend who makes short films in the local area. We have to have a Fire dept guy on hand, but since I only use low grade explosive, they aren't really picky about liscences and permits. Compounds and plastiques they're really picky about, anything that needs a booster to create high explosive detonation. (yer primacord would fit in that catagory)