I just bought a case of Winchester 200 Gr. JSP, in 358 Winchester from a group "Target" something that I found doing a search. It is "on the way"...no entanglements...yet! I'm sure it all depends upon the distributor and (perhaps) where they're located of just their policy.
Best, Capt. Chris
PS: Because...Ya' just cannot have enough 358 Winchester! Wilson Combat even makes an AR-10 in 358! How 'bout that?
CCS