So, I've been messing around with forming 35WCF from 7x65R. I read, pretty sure here, that it was doable so I gave it a go. I'll spare you all of the gory details and frustrations, crushed necks, etc., etc.....but here is where I ended up.
Step 1: Size neck out to .308. I did this using 30-06 FL sizer.
Step 2: Size neck out to .338. I did this using 33WCF FL sizer.
Step 3: Size neck out to 35WCF, using 35WCF FL sizer, then remove, clean and re-lube for FL sizing in the 35WCF die.
Step 4: Off to the lathe to turn about .004 off the base, just ahead of the rim, to get them to chamber and extract easily. (There were quite a few steps prior to make tooling on the lathe for turning the bases!).
Annealing on the front end didn't seem to make much difference, although I will certainly anneal prior to loading as I feel like I've worked the brass pretty hard. Also haven't checked final trim length yet, but assume that might be necessary.
7x65R brass is pretty hard to find, but loaded ammo from S&B is out there at $22-$25 per box, so pretty cheap compared to spending $4-6/case for 35WCF.
They chamber and extract with ease in my 95....now time to get some loaded and bring that old girl back to life!