When we could still buy guns and ammo through the shotgun news, there was advertised surplus 30-06 ammo from WWII in 200 round cans on belts. I can't remember but I think it was about 10 bucks a can. Tracers, Ball, AP whatever.
A high-school buddy of mine and I had had a great winter calling and killing coyotes (coyote fur coats were real fashionable then) and we were rolling in dough, (for a couple of 15 year olds) we pooled our funds and ordered about 400 bucks worth. I'm still shooting it. I have never had a failure of any kind. That stuff is 75-80 years old maybe more.