So, I've hit a problem. Case mouth wall thickness is 0.1mm which is nowhere near enough to headspace on I don't think.
Now this wildcat is designed to work in something roughly approximating a WSM action so I guess the next step is to shorten it down a little more to work in a WSSM action and hope that gives enough brass to headspace on.
Yeah, that's a bit too thin. Mine are 0.014" or 0.37mm.
You can headspace off the extractor depending on the rifle, but it's not advisable. That's partly why I went 300 ultra mag. I can cut it short to give me the brass thickness and still have a reasonable sized case.
Shortened one of the cases down (crudely) and I'm getting around 0.3mm wall thickness at 41mm case length. When I get back from deployment I think I'll take the cases down 1mm at a time on a lathe till I'm at 0.4mm wall thickness.
Measurements are a little rough since I'm pre-occupied but this wildcat looks feasible once again