Interesting data on 110 FMJ effectiveness

[INLAND44]

If you're hesitant to use the 5.56mm for home defense due to worries about over penetration then you don't want to use the 30 carbine either. With FMJ bullets it will penetrate just as much if not more than a 5.56mm will and as long as it doesn't hit an appliance, breaker box or some such it's gonna go through at least 2 and possibly 3 walls with an expanding bullet.

Maybe. But I would use the special ammo I designed and had made (pictured above) with lead hollow point semi-jacketed bullet. And no .30 Carbine FMJ is going to penetrate like M855, one of the most popular 5.56 rounds (at least it was until Holder banned it). Anyway, its not going to happen. I have so many different guns for this purpose that they would most likely find my body in front of the open safe trying to figure out which gun is just right for this incident. And unless somebody makes a semi-auto carbine in .30 Carbine other than an M1 Carbine copy its a moot point for me because I am definitely not using my Inland for this purpose.