Nat,
Good post! Might want to ammend your target description, though. 1k F-class center is 5" X, 10" 10... in fact I don't know of a HP target,other than maybe the 200yd SR) that has a ~3.5" X, 7" 10. At any rate, you make a good point about people using more gun than they can handle. I certainly would rather someone use a gun they know they can shoot well that might be a tad on the 'light' side, as long as they can stuff them in the vitals, rather than some field howitzer that they're going to end up nicking the animal,if they hit it at all). You have to be able to practice w/ the gun w/o it beating you up. FWIW, the numbers I've generally heard for deer/elk respectively, are 800ft-lbs of energy, and 1000. Less will certainly do it, these are more of a general thumbrule to ensure adequate expansion.
On the flip side of the coin... I come from western Nebraska originally, and spent a *lot* of time shooting small furry critters... specifically prairie dogs. Lots of fun, but the little suckers are amazingly tough customers... they'll get up and run like there is no tomorrow after a hit that would probably have me weeping for my mother. As such... I get a little steamed when I see people talking about shooting prairie dogs,or rock chucks, even tougher) at extended ranges,say, 500-600-700+ yds) with a .223 and match bullets. Yes, the gun is accurate enough. Yes, it probably has enough residual energy left to do the job... with a varmint bullet. Not saying you can't shoot animals w/ match bullets,another big quasi-religious argument), but one needs to be aware of the velocity and whether or not the bullet is going to expand at all or just 'pencil' on thru. Most of the 'kills' on p-dogs @ long range w/ small caliber heavy match bullets were luck at best... they just punch in one side and out the other, and barely even expand in between.
As someone else mentioned... hunters in general, and long-range hunters in particular, need to be aware of the ethical viewpoints of others. They may not agree with them, but I think it's only right to try to dispatch the animals as humanely as possible...