I have 2 Tikka T3 270WSM in laminate stainless( last year the fiance took over the 1st rifle so I got another for me!). I waited an extra year for the LS over the stainless. Awesome shooters. 140gr. Accubonds all the way. The one rifle shoots factory Winchester Supremes (wife's) and mine are reloaded using one of BigRedd's recipe, and now I'm trying 140gr. TSX Barnes.
For the 300WSM, I would reccomend 180gr. Accubonds. In my Sako m75 SS 300WM, I have shot many moose, elk and deer in Alberta, using first the Failsafes and Partition Golds, and now the Accubonds. All were the factory Winchester Supreme Ammo, but now I'm reloading, mostly with 180gr. bullets.
With the 300WSM, you will have better ballistics and more energy at a further distance than the 30-06. Both are good calibers to do the job, I just prefer the 300WM or WSM over the -06.
Good luck in your purchase. I will reccomend Tikka Optilock Bases & Rings, and the Leupold VX3 3.5x10x40 with the BC reticle.
PM me your email address and I'll email you pics of my rifles.