300 wsm or 338 wsm

[jc_online]

A friend has been taking me out hunting and im real injoying it. He wants to take me on a bear hunting trip in Canada. So I have been looking at rifles. The guy at the gun shop recomended a Remington 700 with a 300 wsm but I was reading on another sight that you shuld have nothing less than 338 wsm. Now I dont know whut to get. Can any one help me with this problem and may be recomend a reasonly priced gun. Thank You.