When was this magic era of "sportsmanship"? I think it might have appeared in a field and stream reprint in 1978?
Lighten up guys, there is nothing inhumane with getting hit with 6 12 gauge slugs simultaneoulsy! How is it worse then using other primitive weapons, you can't tell me that a 100 yd black powder shot with a single shot is more humane then that.
Don't we all blast away at ducks, geese, grouse and rabbits with a very similar device! How is a deer getting it from a mulit projectile firearm any different then a Goose?
Animals are animals they do not know about "sporting", we owe them the respect of keeping pain to a minimum but beyond that they don't know the difference between death by 18 wheeler, 300WSM, broad head, sabot or cougar. Only the hunted have a chance of dying quick in the animal kingdom.
When it is my time to go I sure hope it is as easy as ignorantly stepping in front of a well aimed patterned cannon.
We should be careful about calling into question the sanity of a man based on his choice of firearms interest. Guess you are falling into the same trap that anti gunners do when thinking of all the guys who lives in suburbia with tricked out black guns and an extra dozen handguns. 
I give buddy a big thumbs up for saftey, humour and honesty.