Keep in mind that some of that WWII axis ammo was loaded by slave labor, and the folks forced into slavery would send a few extra powder charges into the batch to blow up in the users face.
Granted in a true Mauser it would need to be on hell of a bang to cause any damage endangering the shooter, it would be a shame to fall victim to 65 year old sabotage.
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I do the things that I must, and really regret, are unfortunately necessary.

RIP OBG