The only advantage I see for the Wby conversion is for someone expecting to use the rifle for long range (300 yards plus) shooting. Then the added velocity helps with a flatter trajectory. But at normal ranges, there is no advantage. In fact, you could make an argument that the added velocity is a disadvantage, since more velocity (beyond a reasonable starting point such as 2400 fps) leads to more rapid expansion of a bullet which then in turn decreases penetration.