Looks like the double radius shoulder causing short case life myth has been debunked.
On the flip side, I've often wondered the reason for the double radius shoulder in the first place. Is it a derivative of compressible gas dynamic theory (jet/rocket science) that says subsonic gas flow is more efficient over smooth edges? The idea being a bottle neck rifle cartridge is analogous to the converging/diverging nozzle of a jet/rocket engine where gas flow is subsonic in front of the nozzle and supersonic downstream of the nozzle. Of course this analogy breaks down for straight wall cartridges.
Any campfire historians out there know the real inspiration for the Weatherby double radius shoulder? Serious question. I can't imagine RW coming up with the idea out of thin air, but who knows, maybe he did.
