I found a bag of ammo in an ammo can and don't know the maker, or if it is corrosive, or reloadable. The primers are crimped in. Maybe you all can help. I did google it and haven't had a any luck. The head stamp says, 7.62 x 51, then is says MS 128-59. They are loose in a zip lock bag so I don't have a box to go by. Thanks