You're not wrong there! Winchester has obviously stopped giving nice freeby custom .458s to the likes of Boddington, Wieland, Simpson, et al.

Rigby tried necking up the .416 to make the .450 Rigby, but I don't know how popular it as been. Certainly not as hyped as the Lott! As far as I know, it is pretty much a .460 Weatherby without the belt, but I could be mistaken. I'm sure a necked down .5 BMG would be fun, but I wouldn't want to have to rack the bolt in a hurry with a charging ele or buff coming my way, thats for sure!