The 7.62 X 39 does exactly what it was designed to do. It was designed as a mid-range infantry round. As such, it has made it's
rifles, the AK, and SKS shine, in the world purview. Of course, if you compare it to 270, or 30.06, for hunting, it's gonna look like crap.
People who want to compare the M43 to a pistol round,(yet, interestingly enough, apparently haven't discovered 7.62X25, to now) just need to get a reloader's manual, and bone up on ballistics. The M43 is still a rifle round, no practical comparison, IMO.
OTOH, I would be reluctant to put these new, higher powered 7.62 X 39 rounds through my rifles. Sounds like borrowing trouble, to me.