Considering the price of a Vanguard, it's more economical to just buy a 257 Wby but the Vanguard 257 only has a 24" barrel.
To the OP, I'll tell him flat out that a 24" 257 Wby is disappointing. You need the 26" barrel to make the 257 significantly faster than a 25/06. I have both and have shot both over a Chrony and can honestly say there's not all that much difference between the two cartridges in a 24" barrel.
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You are not the only one to have both and the .257 in the 24" barrel still shoots flatter than the 25-06. Guns of identical configurations can and will develop different muzzle velocities from the same ammo due to slightly different chamber and barrel dimensions...thus not all Vanguards with a 24" barrel will have a low muzzle velocity.