Just a couple of things to say, the whole idea of the intermediate round was based around the recognition that most engagements occurred within 300m and typically within half that distance. It was therefore considered that a longer ranged round wasn't necessary for most infantry troops as they wouldn't be shooting past 300m most of the time.
In regards to the Soviet M43 7.62x39mm round being based off the German 7.92x33mm Kurz round, I'd agree that it was certainly influenced by the German round but the Russians had been developing intermediate rounds almost in parallel to the Germans for about the same length of time if not longer. They both had numerous ideas resulting in various cartridge calibres and lengths but to say that the M43 was based off the 7.92mmK is a bit misleading.
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