Think he meant the 8mm mauser ,303 and the like, ie the std infantry rounds of the time, large long range cartridges. After WW1 The germans realised why have a round that will go to 2000 metres when most shooting is done between 50 and 400. The 7.92x33 Kurz , a shortened and version of the 7.92x57was their answer to the problem and the Sturmgewher mp44 probably the first "assault" rifle issued anywhere.
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