From:
http://ammo.ar15.com/project/Self_Defense_Ammo_FAQ/index.htm#.30%20carbine

.30 carbine

From Doctor Roberts: "The best ammunition choices for the M1 Carbine are the Remington 110 gr JSP (R30CAR) and the Corbon 110 gr JHP DPX loading using the all copper Barnes X bullet. The Remington load has an average velocity of 1864 f/s, expands to around .54� to .58� and penetrates 13� to 16� whether in bare gelatin, through automobile windshields, or Level IIIa body armor. This is comparable intermediate barrier performance to many good .223 loads. Likewise, the Corbon DPX load penetrates 18.9" and expands to 0.56" in bare gelatin. The Winchester 110 gr JSP also works reasonably well, but has a bit smaller permanent wound channel compared to the Remington or Corbon DPX load. In addition, the new Speer 110 gr Gold Dot carbine load appears very promising based on the factory test data released at SHOT 2009"

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New data shows that the 110gr Speer Gold Dot bonded soft point load is also a very effective performer. Penetration is in the 16-17" range through most of the FBI barrier test with near perfect expansion. Velocity at 10ft averages right at 2000fps.