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About that amount of time. Especially if the powder doesn't substantially corrode the case.
Fired a 45.70.500 case from the 1880's-early 1890's, back in 1989, it did fire.
Still have it around somewhere, although alas, the rifle was stolen.
Sounds like an excuse to finally pick up another springfield.
Might varnish the case mouths and primers.
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