And, at a full 100 yards, the .30 carbine still has about 550 ft pounds of energy, the equivalent of a standard 158 grain .357 round coming out of revolver with a 4 inch barrel at point blank range. And at 200 yards, the .30 carbine still retains about 350 foot pounds, approximately the same as a 9mm fired from pistol at point blank range.
None of this adds up to much if you use the full metal jacket military ammo, but using standard factory softpoint ammo, it is quite deadly
Someone mentioned a 9mm high point carbine, which is an interesting combo, but does not come close to the foot pounds of the .30 carbine. A 9mm carbine is at best a 50 to 75 yard weapon. The M-1 has far greater effective range.