A 45/70 through the torso would exit with nearly as much force as it entered with. There's a lot of mass to that round. It will definitely put an intruder down but hope there's no good guy behind them if it doesn't hit enough bone to slow it down. 00 is a good choice for close encounter. None other than Elmer Keith recommended an 18 inch barrel shotgun with 00 for home defense. Birdshot is only good from extremely close range. To get back to the 45/70 it's pretty long for close quarter work. If I was going to use a hunting round up close it would be a 30/30 carbine. The AK47 fires the 7.62x39 which is essentially a 30/30 with a spitzer bullet.