I'm throwing this out there to see if it sticks to the wall or falls.
What about expanding the shoulder out to straight with a succession of dies (8mm,.35,375, 44) then reversing the process till close to what you need; then using soot to get the shoulder in the correct place. When they chamber with slight resistance, load&fire then neck size afterwards. Virgin brass to start and anneal beforehand. Of course this brass would probably only fit your rifle, but seems like the way for brass life. BTW I've always wanted a Savage WW2 Enfield- kind of a Hands across the Water thing......Best, Thomas.