The SA-Large Shank actions are out there to be had. IIRC one just sold in the classifieds in the last couple of weeks.
My question to you is why must it be a large shank? The WSM case works perfectly fine and safely in the standard shank. I have a 6mm-WSM built on a small shank and it works fine. I also had a 300WSM on a small shank for a bit and it worked great as well. I have found that the Centerfeed Long action works great for the WSM's, just use a standard magnum bolt head (like for the 7mm Rem Mag for example) and then the CF magazine for the standard magnums (7RM or 300WM). Feeds fine, and shoots fine and no limits on how long you can seat the bullets.
Just some food for thought.
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