The Savage LA has been used to house monster magnums and now is used to shoot the 338LM.
The 300Wby was a factory offering years back.
Problem isn't the barrel swap, its the mag.
The new gen action mags are too short and getting parts/modifying the action is a royal PITA.
If you really want a WBY, consider a HOWA or Rem magnum LA. Although the barrel install will be more, the hassle of making it feed will be way less. In a hunting rifle, which I assume this will be, function is everything.
Personally, there is precious little real world benefit between these two cases in standard length barrels and the usual hunting weight bullets.
If you really want more case capacity AND still use a standard magnum action, the 300DAKOTA will do the same as the Wby and should fit quite nicely into the standard magnum box.
Let me know if I can help you with barrels - Shilen and McGowen.
Jerry