Firstly let me say thank you to all of you who left comments, both positive and negative. I think it's great that alot of you are so passionate about the sport we all love so much. Granted, we can do without the name-calling, but your opinions are welcome.
Oh, and allow me to make a couple of corrections to my first post: 1) I should have said "ironic" part instead of "fun part". 2) The buck wasn't in a full-tilt, tail-up sprint, it was more like a casual "trot".
That being said, let me add this: I completely agree that taking an unsigted rifle out and firing it at an animal was a mistake. A mistake that I unintentionally made, because the weapon is not even mine. It was a loaner from a friend, and my mistake was in assuming that it was sigted and ready for the hunt. If I had known it was not properly prepared, I wouldn't have even taken it out of the safe. Shooting at that deer could've been disasterous and I feel lucky that the factory bore-sighting was as close as it was.
I'm not the kind of hunter that would just run out and buy the first gun I found on sale, and go out and shoot anything that moves from the back of a truck with a beer in my other hand. That's an exaggeration, of course, but hope you see my point and maybe even find some humor in it. Now, do I feel like I took a risky, irresponsible shot? Absolutely not. If I knew the rifle wasn't properly prepared, would I still have taken it? Absolutely not! I saw what I thought was a good opportunity, and took it.