As couple of you correctly statted, the box in the OP is 7x57 Mauser RIFLE ammo, made by FN for export to Argentina (to accompany FN Mauser, Argentine contract). Ammo is marked "ORDINARIOS" in Spanish ("normal" or "ordinary"), as opposed to tracers, armor piercing, and blanks (all available, and shipped to Agrentina by FN). This ammo is CORROSIVE (as John warned you all), but perfectly safe to shoot.
Immediate cleaning after fire is a MUST (and drilled into us military folks, regardless of the type of ammo!). According to MOST militaries in the world, corrosive ammo has a shelf life of 50 years, and the military stock is rotated as such. I fired some ammo that was approaching 100 years of age, without ANY problems. Come think of it,..... ALL my stock of 8x57, 7,62x39, and 7.62x25 is well over 50 years old now!
Fire away.
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