I've been reading the stickies and past articles on loading the 7.62x39 using the Lee 312-155-2R boolit and 14-15 grains of 2400 powder. I have lots of A2400 available, and just picked up a Lee 312-155-2r mold and boxer primed brass cases from members here. What I can't seem to find any concensus on is die selection, particularly neck expansion. I'm going to throw out for input the following for comment. Note I am planning to shoot these in my Russian SKS.
Step 1: Lyman universal decapper
Step 2: full length resize with lanolin/alcohol lube with RCBS 7.62x39 die with the expander plug removed
Step 3: Lyman M expanding die with the 31R plug (planning to start with .311 sized boolits and gas checks).
Step 4: RCBS 7.62x39 seating die
Step 5: "Lightly" applied crimp with Lee 7.62x39 factory crimp die to remove the neck expansion.
My apologies if I have missed a sticky on this, but I would like to get the dies ordered and would appreciate the feedback. Jim