Thats true , thats one of the reasons that Luger upgraded their cal to the now famous 9mm version , they tried to sell it to the US Army , and it was rejected because the original cal was not powerful enough . Also as you know , some military rounds do very well at some things , and suck at others . The 7.62×25 Soviet , did very well as a pistol round in WW2 , I have heard that the M1 carbine was a mistake , correct me if I’m wrong , but the cartridge was not bottle necked either , more like the old cowboy rounds of the post civil war era . Perhaps it goes into the ” what were they thinking ? ” category ? Your right , every country had its share of lemons , even the Russians had several problems attempting to replace the mosin , the cal rounds they chose were fine , they just had some severe design problems to work out , not good in the middle of a war at a time when your not winning .