Purchased this ammo a while back, haven't been able to identify it. Headstamp is "1979" and 3 cyrillic letters. I'm assuming it was manufactured in 79 and is Russian or other commie made. Seller only had 4 20-rnd boxes, wish he'd had more as it is very nice, shiny stuff. Have not shot any, just re-discovered it in the closet. Is it corrosive?
TIA- Mike