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halfmoanut
Reply with quote  #1 
Will the runout remain the same if it is alot after neck turning,and sizing down to proper neck tension or will it get better after fireforming?Also what is the most popular neck tension .001,.002,.003?
gunamonth
Reply with quote  #2 
Quote:
Will the runout remain the same if it is alot after neck turning,and sizing down to proper neck tension or will it get better after fireforming?


Say what? You must have been a math major. I have no idea what you're asking.
Winchester69
Reply with quote  #3 
Sizing down induces run-out. It will improve after fire-forming.
fdshuster
Reply with quote  #4 
halfmoanut: Ditto to what Winchester69 said. Anytime you change the diameter of a case neck, you are subjecting the entire case , especially the shoulder, to a lot of stresses. Since the shoulder is largely unsupported while your necking up or down, it will collapse, some brass more than others. It will straighten with the first firing. If your question relates to how much the sized neck dia. should be reduced prior to bullet seating, all three of your examples are correct: It can be whatever you decide works best for your cartridge/rifle/ type of shooting/ semi-auto or bolt, etc.
BoydAllen
Reply with quote  #5 
It will get better after fireforming. The trick is that for best results you need a FL die that is a close match to your chamber.

As to neck tension, my 6PPC using VV133 and typical Benchrest bullets, likes a lot of neck tension. With a different powder, less has been required. Experiment.
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