i would choose the .300wsm. i do believe the .270 is a legend and will continue to be, but i also think the .300wsm is here to stay! it will be a legend one day too. as for the recoil, have you thought about putting a muzzle break on your wsm? my dad had one put on his .300 winmag and its like shooting a .22, a lot louder though. since your taking the time and money to upgrade your stock, go ahead and put the muzzle break on the .300wsm. gl