Re: 223wssm and243wssm
I tend to agree with Brent, and most of the other posters. It also seems that the .270 WSM, and .300 WSM parent case make for a nice wildcat, I think that is the shortest case I would consider.
Most gunsmiths, at least from the posts I've been reading will use the WSM as the parent case to build from and use a long action magnum bolt face as the platform to build the custom rifle from. Short actions tend to win in the accuracy department. Unless you are shooting bench rest I don't think it should matter much.
I think the long actions are here to stay. The WSM's aren't the best for the heavy bullets either, so the long actions will win out in that department as well.
"A tie is as good as a loss, and no one remembers second place."