I wouldn't dump a large quantity of ANY 209 primer into a bag or bin and try to fill a 10 x 10 tray by putting the empty tray inside and hand moving the primers or shaking the container. Primers are separated in the commercial tray for a reason and the open (anvil) end is separated from the adjacent primer by a plastic barrier. I'm thinking a sympathetic detonation of all the bulk primers in a bag or container is possible - remote possibility as that may be - by static electricity, a loose anvil, primer mix that wasn't properly loaded, or whatever.
