RE: buck shot
Catus,
I wasn't advocating using buckshot for 100 yard shots, and I think that it would carry too high a risk of injury, but you are getting carried away.
You say you have used buckshot, but a 40 yard max? So you are limiting a high powered shotgun shell to archery distance (or even less)?
If I had a tight choke, and was shooting a magnum load of 3 1/2" 00 buckshot, there is no reason you couldn't make an effective shot out to 60 or 75 yards. That isn't that far! Now, if it is some kid with a light 20 guage load of 1 buck, well then maybe 40 or 50 yard max, but that is not what most people shoot.
I don't deer hunt with a shotgun anymore for other reasons, but telling people the max range of buckshot is 40 yards is spreading misinformation. I have been around shotgun hunting since I was a kid so I know what I am talking about.