Crow Feather-
Not arguing but putting my cents worth in. I have hunted with nothing but a .270 for 18 years and have routinely taken Deer, Elk, Goats, prarie dogs, and about anything else you can find around here ( Wyoming and Montana) and dropped most, not all but most, with one shot. I ended up dropping a bull elk with a shot from my .270 after a client (years ago when i was guiding) shot it three times with a .338. He shot it in the chest and I put it down with a round to the neck (another argument). I am not saying i'm like everyone- better or worse, just one opinion. I feel that someone who pays attention to where they shoot, How far away the shot is, and has enough respect for the animal to practice until proficient can do well with what ever they choose to shoot with. I have worked for a guy who shot every deer i saw him shoot with a single shot 22mag. He head shot them from about 50 yard and never had one take a step after he pulled the trigger. Was it adequate- yes, Could anyone else do it? not with out alot of practice. do i agree with it? No. The story just goes to make my point.
Beware the man with one gun, for he likely knows how to use it.