All Weatherby factory chambers have the long throat "Free Bore". It is to comp. for the large powder charges and high (compaired to others) pressures encountered with the Weatherby chamberings. DO NOT USE max listed powder charges with bullets anywhere near the riflings (If you can get there)...
What state(s) do you hunt big game in most often?
Texas
What is your primary long range hunting cartridge?
340 Weatherby
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Regarding your primary long range hunting cartridge choice above:
Do you use factory ammunition?
Not for long range work...