Re: 300 WSM vs 30-06 AI - HELP!
Welcome to the board. For me, it would depend one thing first. Would you possibly be rebarreling or rechambering to a longer cartridge later, ie Ultramag length? If so, action length would be a consideration.
A Remington will be long enough for all of them if you start with it. If you go with a WSM your stuck with a short action and won't have the option later.
I would go with a WSM if not stepping up later myself.