I don't think he's kidding at all, and I tend to agree with his statements. He did qualify it by the "vast majority" of hunters. I would bet that the "vast majority" of shots at deer in this country are taken at less than 150 yards. At 150 yards or less, for deer sized game, heck, even for moose, elk and caribou, a 7mm Mag is way more than what's needed to put the animal down humanely. The gentleman who asked the question said he's primarily hunting whitetails, and hogs up to 400-500 lbs, and he's suggested that he already knows that the three calibers (.270, .30-06, and 7mm Mag) he's trying to choose from will fill the bill for him with regard to trajectory and range. All three calibers will work just fine. But, there are penalties to be paid for choosing the 7mm Mag in the form of more recoil, more noise, more costly ammunition, and more unwieldy rifle (since the magnum barrels are usually a couple inches longer than on standard calibers). For the vast majority of shots, I'd agree that the 7mm Mag is overkill. The added power doesn't make for more humane kills on this type of game at usual ranges(i.e 300 yards or less), the recoil is not pleasant, the cost of ammo is ridiculous, etc.

If you're one of those rare hunters that takes 400-500 yard shots, then, maybe you need the slightly flatter trajectory of the 7mm, but, for most instances, the standard calibers will work just fine.

For what it's worth, to the original poster, I'd also take a serious look at the "short-action" cartridges as well. .308, 7mm-08, .260, and even the .243 will all do the job you've described.