The critical WT measurement(s) are every inch from breech to 16-18" (the location of the forward hand), esp. the end of the chamber and forcing cone if the chamber or cones have been lengthened.
End of chamber, 9" from breech and muzzle, and overall MWT are the numbers commonly reported. A dealer's listing of only MWT means little.
https://docs.google.com/document/d/1ZIo0y746UsSRZIgRuuxwAbZjSBHitO_EanvwLYc-kGA/edit