Here's the breakdown:
30-06 is a proven, versatile, and high powered cartridge. It can be loaded up or down in so many ways it's crazy. 300win mag allows you to gain 2-300fps velocity over 30-06 giving you flatter trajectories but this comes with way more recoil. The magnum rifles are usually longer, but not by much. 300win mag generates velocities that call for premium bullets. The ammo is more expensive and less versatile.
Many people think the magnums are just a chest thumping cartridge, or for guys with small man syndrome. I think variety is awesome but I don't really see a point in going 300win mag over 30-06. I personally like 308 short actions because you have smaller rifles, more scope mounting flexibility, more ammo capacity, less recoil, and marginal velocity loss over the 30-06.
With all this magnum bashing, I'd still take a 300 if I were going for grizzlies. Considering how there are none where I live, I don't own a 300 or a 30-06. I stick to 308, 303British, and 7.62x39
do you think a grizzly will see and tell the difference between a 30-06 and a 300 win mag ?
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