I knew a real mental midget who kept several thousand large rifle primers loose in a pint Mason jar. Stuff that explodes - - - -stored in a glass container! There's a reason they pack those things in padding so they can't even touch each other. I don't know if percussion caps are more or less sensitive than primers, but it doesn't seem to be a good idea to have that many crammed together.
Jerry
They come 100 to a tin, packed loose, so I doubt it's a huge concern.
