I may have to take it back. I finally located a military priming mix that includes PETN (MIL-P-46610E(MU), 3.7.1). Surprised the heck out of me to see it there, as I don't know why they'd want it, but I'm not their chemist. Perhaps it's filling the same roll as TNT and DNT that has been used in some primers in the past, and that is as a fuel for the flame rather than as a sensitizer. I just don't spot PETN in any of the commercial primer MSDS sheets.
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