The M1 Carbine is the standard by which all PDWs are measured.

[stanc]

I just notice the Hornady Frontier ammunition is advertised as a 123 grain FMJ bullet. It would be interesting to see how the 123 grain 6.5 Grendel FMJ would stack up the PPU 110 grain 6.5 Grendel compared 762x51 ball M-80 and 5.56 M-193/M-855/M-855A1.

Indeed, that would be interesting. Hornady's website has no info on the 123gr FMJ ammo, just this drawing.