Hey all, this might be stupid question so sorry in advance...

I have a Mosin PU that i need to zero. I have one of those 440 tin cans of corrosive ammo dating to the 80's.

I dont know much about ammunition. How big of a difference is this surplus stuff to modern loads? Am I wasting my time by trying to zero and test my rifles capabilities using old ammo?

I also have surplus corrosive Ethiopian 8mm ammo for my k98. Their hasn't been any duds, but their has been half second delays.
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