I did quite a little combat shooting some years back. In the hands of a good pistol shooter the 45 ACP can do some remarkable things However in the hand of a novice or green recruit, the 45 auto is a joke. It is not easy to master the recoil and rather short sight radiuos. The 30 carbine was a much more shootable gun and easier to master in a short time. The ones I shot in the military though were certainly not effectice a 100 yards. It would be like throwing a pail of rocks. I had a couple of them and they are fun to shoot but I once hit a badger six times before he was done. They have about one third or less the effective range of a 30-30.