You get 250-400fps more with 300wsm vs 30/06 and within 50fps of 300wm with a lot less powder. Do you need it? Probably not for 90% of hunting but you can also kill most anything that walks with 308 inside 300yds.
I think 300wsm is a great all around cartridge...load 150s at moderate levels for deer and 180 ABs at 3000fps for anything bigger. Very easy cartridge to hand load and recoil is manageable in a 7lb rifle.
