Ive shot ammo i loaded in the 90s but then i know what was in it.
I also regularly shoot mil slurp from the 50s and 60s with no issues apart from the occasional hangfire with some 40s stuff. A bit of copper corrosion on cases, green greasy or powdery stuff has never worried me as long as it wipes off. But its your call.
The lee hand loaders i think you are talking about turn out good ammunition just slowly.
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