Actually it was documented (though I can't find the sources now) that the Germans DID order 7.63 Mauser ammo for captured Tokarevs. The problem was the Russians did not really stock much ammo for these guns. They were a secondary weapon, and they could barely produce enough ammo for the Mosin early on. So often an officer would go to the front lines with just the ammo in his two magazines. If that got used up, that was it. When the Germans captured the weapons, they needed to supply additional ammo.
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