Hi all, just picked up tonight 50 round of what I'm told is 762x51 canadian army surplus. The guy had it for many years and offered it up for 25 bucks, all on 5 round stripper clips. The head stamp has IVI with a circle with a plus sing in the centre and the number 78. I was wondering if I should blast this stuff off in my m14 or would it have any collector value? What the shelf life of this stuff, assuming proper storage?