Makes a huge difference if the 300Wby you have is a Mk V or a VanGuard, in what other calibers you can swap the barrels to get into. MK V's are a longer reciever and ex: acccomodate 308 dia bullets the VanGuard will not in the longer or heavier bullets in 300 Wby.
MK V's, like the WW M70 Safari grades & other similar receivers capable of handling longer than 30'06 ammo are sometimes called "Magnum Length"...and will handle the 375 H&H length ammo etc.
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