“I recall when US cops used them, and they never complained about killing power.”
Jim Cirillo loaded it with 110 gr softpoints and said it was the only 100% one shot stopper the NYPD stakeout unit ever found. He was in 17 shootouts with revolvers, semi-autos, and 12 gauge.
At 300 yards the M1 Carbine round has the energy of a .38 special at point blank.
Most police work and self defense is done at much closer range.