Sensitive primers
)Mike, you beat me to it! Primers are very new-age, cry easily at others' pain, can't stand the sight of blood, etc, etc.
Seriously, as I understand it, they are sensitive to heavy pressure like a cowboy boot on a concrete floor, and to impact. Impact, after all, is what makes 'em go bang inside the gun's chamber.
There is a story from WW II days that in some armory, a worker was carrying a metal bucket of rifle primers to the machine that seats them in the cartridge cases. He was jouncing the primers up and down in the bucket as he walked. When the dust cleared, they did find one of his feet, that's all.
Personally, though I can't reccommend it, I've vacuumed up both primers and smokeless powder with a hand-held, and with a shop-vac. They all get stopped by the filter bag, and don't get into the whirly parts nor the sparks. (I would NOT risk the same thing with black powder!!)
Once or twice I've accidentally seated a primer sideways in a primer pocket. Takes more pressure than usual, and you'd think I'd have noticed. (Guess I'm just not very sensitive myself!
) Anyhow, saved the cases in question by running them back through the resizing/decapping die, with great care, and with gloves, hearing and eye protection, and the primers, while thoroughly ruined, did not go off during the process.
Have had occasion to get rid of suspect primers, both in cases and out. Using hand, ear, and eye protection, the in-case primers were set off by putting the case in a vise and hitting the primer with a nail-set and a hammer (just like a gun's firing pin). The loose primers were set off by placing on an anvil and hitting with a hammer. Takes a fairly good blow; they don't go off with just a tap.
To sum up: Primers are explosive, and as such must be handled with due caution. Mishandling them can have serious consequences, especially mishandling a large number of them at once. When getting rid of them, protective gear should be worn on hands, eyes, and ears. But when care is used, they can be stored, handled, used, and disposed of safely.