My dad is a collector of WWII rifles and I've used period ammo in period guns. Basically as long as they are not corroded you can use ammo. Durring 1972 an SAS member restored a Nordfelt gun in .45 Martini-Henry. They found a batch of ammo from 1890 and needed something to use up the ammo so they restored the gun as a idle project. Not all the ammo worked but most of it did fire. Basically it was a problem of a gun designed for solid brass cases being fed rolled cases.
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