Yeah, made me think about buying a lead sled. It’s the first one that really screwed up on me. I shoot modern ammo the first time out. If that goes well, I try the old surplus, if in good shape, I have.
You better watch that old surplus.
Some of it has been hauled around for many miles with terrain and vehicles that generate significant vibration. The powder can actually grind itself into something that burns much more rapidly that originally intended!
Furthermore, you have no idea of temperature extremes it has been subjected to over the years, which can cause many problems.
That being said, ammo stored to avoid temperature extremes, moisture and vibration will almost last forever.
It’s sort of like one of my secrets to getting 50 year old engines to run really hard.....DON’T PUT THEM TOGETHER WITH 50 YEAR OLD BOLTS!
Maybe a better analogy to ammunition would be....DON’T USE 50 YEAR OLD OIL (or gasoline) EITHER!