I wouldn't call myself a gun lover, just an owner, but I was just involved in the shooting of a ~4' snake! It was at my back door and I didn't see it until I opened the door and it tried to come inside. I quickly shut the door, pinning him as it was trying to bite my exposed foot (wearing Crocs sandals)! I was actually more worried for my dogs (a couple of Jack Russells) and I'm glad I had a water bottle sprayer handy (had to keep spraying them in the face to back them off). I had my wife call my father and he rushed over and shot it from the outside it with his .22 rifle (belonged to my grandfather), injuring it enough that I could open the door push him out with a PVC pipe she handed me (that we use to check the mail with, in case some crazy animal wants to try and have a go at us). My father then shot it in the head. Ah, living in the country.
Edit: Currently comparing my pics and investigating what kind of snake this was, I think just a large water snake (known as a fake Moccasin).
2nd Edit: Confirmed, round pupils with a solid yellow belly (although angular head to look like a Moccasin), this one was non-poisonous. But I still wouldn't want to get bitten by it.