If you shoot it, be very careful.
The military was still loading certain batches of match ammo with corrosive primers and some with corrosive AND mercuric primers as late as the mid 1960s.
If the rounds are so loaded the boxes SHOULD be market.
Corrosive ammo requires the rifle and gas system to be cleaned with a water-based material to dissolve the priming salts that could lead to rusting.
Mercuric primed ammuntion requires DISPOSAL of the cartridge cases - they MUST NOT be reloaded.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.