Tony I use a .358 Winchester Die set to neck up the Cases. I then run them through a .303 British Lee RGB Die I had reamed to match my chamber. I trim to 55.6 mm with a Lyman Lathe type Case Trimmer and then Fire Form. I also use the .358 Winchester Dies for neck sizing and to seat Projectiles. I have not needed to use my Full Length resizing Die other then when forming Brass and am on my 8th reload, No case stretch. I use Remington Brass mostly and have some PPU Brass.

I also size the CBE 358250 Projectiles to .359

regards Jacko