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If you can patent/trademark the WSM you can do what he has done. Would be reasonably easy to get around. He seems to use two/three steps in his throat. Use less or a gradual angle should get around...

Yes you are right normally, but Hornady 338 lapua brass is a lot softer than Lapua 338 lapua brass. Lapua 338 lapua brass doesn't normally show pressure signs until way past normal safe pressures.

I had heard that Kirby Allen would use hornady brass to determine pressure with his 338 Lapua wildcats and then change back to Lapua brass

Here is a link to a Brian Litz article which is good http://www.bergerbullets.com/wp-content/uploads/2013/03/COAL.pdf

Abe, my take would be, by extending the length of the loaded round you have increased the volume in the case and therefore reduced pressures.