In 2008 I was commissioned to design a .375 wildcat at 1.625" based on the 505 Gibbs/Chey-Tac case.Ok now whos gonna take a 20 MM Vulcan shorten it to 1.625 neck it to .357 and go for it!!!!
That's the biggest case head you can get a reasonably priced action for.
The customer owns all of the tooling and the design, but needless to say - it is quite a stomper.