Love how people act like the STG44 was a Nazi death ray, and the M1 carbine is denigrated as mere handy pistol.
The facts are, 125 grains 7.92 at 2250 fps for the vaunted STG44. Yet the 30 Carbine is 110 grain 7.62 at 1990 fps.
There is almost no practical difference.
Oh, except there is one difference. The M1 is half the weight and twice as ergonomic as the German try. When I held an StG44 I was amazed at the weight and awkwardness of it. The AK outclasses it in every way too.
But 30 Carbine is a far far better round than people realize.
Ran your numbers thru a calculator.
Muzzle energy STG44: 1405.5 ft/lbs
Muzzle energy 30 Carbine: 967.5 ft/lbs
I’m no firearms expert, but I’d think 50% more energy would usually be considered significant.