I just picked up a 1947 K-31 Swiss Dies and Brass in hand.
Have RCBS 165gr
Saco 120gr and a few others
made a couple of dummy rounds
The 165gr Touch the rifling but it does not engrave the boolit with the rifling
the 120gr do not touch.
Is the 120gr to light?
Also have some 284 win brass. does it reliably extract?
Thank you
Jeff