Interesting thread here. I have no idea concerning double radius shoulders and weakness in the neck / shoulder area. I pretty much use neck sizing only on my 257 Wby and the brass seems to last a long time. Gotta start keeping better track of the number of reloadings. The double radius design was supposed to promote better gas flow or something like that. Probably just a marketing ploy but who knows for sure. I bet lots of folks, including me, see a double radius shoulder and it just screams " high velocity, high performance" . That's the way old Roy wanted it and it worked on me. It's sort of a unique marketing concept and Roy knew how to market stuff.
