In terms of recoil, I find the 300Mag to be the most unpleasant. The only reason to own one is big bullets (180 gr +) going fast. The recoil seems fast and sharp. I could probably load my .338 up to unpleasant levels with 250 gr bullets, but find the 210 gr kill just fine. The 30-06 is the most accessible of the three.
Of course the stock design and how it fits you makes a huge difference.
