I'm late to the party but saw some earlier mention and discussion of the 300 WSM in comparison to .30-06, and the common claim of superiority based on higher velocity "lighter" short action, etc. etc. I don't think I've ever seen an action for the WSM line of cartridges that came in lighter than a long/standard action intended for the .30-06 family. You'd have to work hard to make an action lighter than Melviin Forbes has done in his NULAs and yet his model 24 (24oz) is intended for the .30-06 family and his model 28 (28oz) action is intended for the WSM family, etc.

Where does this notion of a lighter action for WSM cartridges come from and why has it never been put to rest?