I don't like it. With such a short neck I can see heavy bullets shunting in the magazine, unless you can find some with cannalures in just the right spot.

If you do have two barrels or must have a smaller round for greater mag capacity or some other reason, the standard case head makes some sense. If not, why try to push a standard-case round to 338WM velocities?

I've never had a problem with the .338 magnum's belt and it does as a headspace safeguard and adds metal to the head. Lose your ammo in Africa and I know which one you'll find easier to feed.

I don't see the point of ultra-light bullets in that bore size, either, but am quite happy shooting 300-grain Woodleighs in my .338. That was, after all, the definitive weight used in the 333 Jeffery, and it had a smaller groove dia.