Re: Zika,  I asked Frank about those moulds last summer.  he made a run of them a few years back.  I don't know if he does one-offs.  He advertises in the Journal.  I know his production shop is pretty swamped; he does a lot of non firearms production stuff, fitting the Brownells product in the gaps. And we are all waiting for his Ruger SS trigger too!
I'd have liked a Zika mould as well, but got the one Buffalo sells.  Since my 8.15 is a light stalking rifle it works fine for it. A match rifle might be a different story.
My offhand match rifle for next year will be in 7.5 Swiss and I'd like a SR bullet for it.  I contacted Dave Mos a while back about one, but no response so far.
Finding one of the Zika moulds might best be done on the used market, here and flea-bay

The necks of the fired cases from the .321 barrel measure .345. The cases fired in the .316 barrel measure .350. 

Queersome, mighty queersome!  

                Joe.  

Hi Frank.  My .316 rifle is shooting the .321 Zika stop ring nicely with no leading. My new Aydt shoots it super too. 

I plan to do the chamber casts this coming week. 

Yes, I used to shoot a .321 Pope style 200 grainer breech seated. It was a bugger to breech seat.   

I'll measure the ring on that bullet later. Just got home from Seatac.

                    Joe.