Freebore is the term strapped to wby chamberings. While magnums have freebore wby typically have more. The theory is (to my understanding) more pressure build up.Another reason the 257 wby is fast- case capicity behind the .257 cal bullet. The 257 wby caseis essentially a7mm rem mag except with wby rounded shoulders.

I use to own a 300wby accumark it was a very nice looking/functioning gun but was a tough shooter. It was elk/moose gun for me with 200 gr Nosler Parts. I couldn't get the gun to group under 1.5" at 100. But the real bear was it kicked me like a rented mule. I personally wouldn't pay the price for wby again, I would much rather buiold a custom instead off a 700 action.

I will say a shooting pal of mine has a vanguard .257 wby, if they produced lefty actions I'd have no problems considering them. His shot good right out of the box. The Vanguards come with the same 1.5" gaurantee as the other weatherby models, his had a target enclosed with it that met the gaurantee!