I do think there is a trend toward standard calibers, that the magnum business has been something of a fad.
A factor in the movement toward more standard calibers also gets to a more savvy approach by hunters and shooters, the game changing laser range finder, and more accurate rifles generally available.
We haven't paid the impact of the laser range finder in longer range shooting and hunting its due on this subject. Until this technology became readily available, we put a premium on flatter trajectories as a hedge against hazy range estimation. Now, with an accurate rifle and a shooter who knows how to use it (with a knowledge of its trajectory), the flatter trajectory of magnum calibers matters less than it used to in terms of hitting game. I think this factor plays a part of the renaissance of the 30/06, for example.
All that said, my favorite rifle just happens to be chambered in .300 Winchester Magnum. But I'll quickly add that it's more about that rifle than the caliber.
