The 30-06 is still the most versatile 30 cal ever made. Today I own several rifles of 30 caliber rifles in 6 different 30 cal cartridges. 30-30, 300 savage, 308 Winchester, 30-06, a "hi-bred" 303 British I barreled to use standard 308" bullets and a 300H&H. In addition to the 30s I have now I have had and used 7.5 Swiss, 300 Winchester, 308 Norma, and 30-378 Weatherby.

My experience tells me the 30-06 covers more bases and does more with fewer down sides then any other I have used. The closest "2nd place winner" is the standard 308 Winchester.

If I were forced to own only one 30 cal rifle it would be a 30-06 for sure.

If I were to be forced to own only one rifle from all calibers combined, I would probably still choose the 30-06.

I might choose the 375H&H over the 30-06 if ammo were to be limitless because it extends the power band upward quite a lot, but the accuracy and trajectories of the 3 shells is about equal, easily giving me more range then I like to use anymore, and both shooting under MOA in accuracy. I live around a lot of elk, moose large bears and some buffalo. For 99% of the countries population the argument that may push toward the 375H&H would not exist.

So I have to say the 30-06 is still the best overall round a man can get if he wants one rifle for every purpose.

There is really no such thing as a one-size-fits-all rifle, but the one that comes the closest is a 30-06 in my opinion.