i will add to the above. if you are in a clear "shoot the basterd situtation" like he is in your house, and has a gun, and you decide to shoot, you must kill him.
***************************not a lawyer, so if you dont like what i say, i dont give a shit, and dont bitch me out, and if you kill someone in your house, dont tell them i told you too************************************
if you kill him, and he had a weapon, you will proly avoid legal trouble, but will likley be talkin to civil court by his family. they will give a sob story, and hopfully, he has a record, and its over. you have at least an OK chance of getting off with just legal fees.
if you take of a limb, or leave the guy shittin in a bag, he will get up on the stand and give some big sob story about how he ended up in your house while in a drunken haze, and some far right extrmemist (you) blew out a portion of his colon. now you get to pay for this assholes medical bills and pain and suffering.
centermass #4 or bigger is the safest way to go