I've been making 35 Whelen cases from 30-'06 cases for almost 20 years now. With the RCBS dies that I use, case forming is quite easy; just run 'em through the sizing die. No fireforming is required. Imperial Sizing Die Wax works quite well as the lube. Even though we now can get factory Whelen cases, I still like turning '06 brass into one of my favorite cartridges, the great 35 Whelen. Good luck with yours.