in my COTW, 3d ed. the closest I can find is the 8 x 65R for a basic case that can be altered. I have tried .444 Marlin for 8 x 57R, but it wrinkles when choking it down to 7 x 57R.
BTW, I've never heard of a rimmed .30 '06. Is this a project? I think there are several wildcats based on the .444 case.