Re: 30-06 vs 300 WSM vs 300 Win Mag look at these numbers
The 3006, RL17 and the 208-210 pills is a formidable hunting combo.
That said, I prefer the 308 over the 3006 and I like the 300WM over the WSM. The WSM does have less recoil than the WM but the WM will always drive the heavies faster.
For a 1K deer rifle, any of these 3 can and will get the job done with the right load. The 06 with the best life and least recoil, the WM with the least amount of drift and most retained energy yet the least life and most recoil. The WSM doesn't give up much to the WM ballisticly and is a great balance and great all around 30 cal cartridge. They all have their pros and cons.
This really boils down to personal preferences. Do you want minimal recoil or the maximum horsepower? OR, something in between?
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.