Wow, nice problem to have. I'm not exactly sure what you are asking. I would shoot the gun, but probably not with that old ammo.
Two reasons:
1. Old ammo is very collectible, and you could probably get a very good price from a collector. I'm curious. Are the boxes full? What brand are they?
2. Chances are your early 250-3000 won't shoot very well with 100 grain bullets. You could test that by shooting a box of modern 250 Savage factory rounds. I haven't seen anything other than 100 gr loads available.
If the 100 grain loads don't stabilize, handloading lighter bullets would be your only other choice.
mike
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