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o2fish
Reply with quote  #17 
284 Shehane

????? Case Prep your Virgin Lupua brass first OR Fireform and then prep.Comments Please.

Scott

TonyR
Reply with quote  #18 
I use a 0.310 loaded neck with a 0.313 chamber neck so I expand to 0.284, turn the necks to 0.013 per side, clean up the primer pockets and flashholes, fireform, and trim to length. It is not clear to me what I gain by trimming the necks because the untrimmed fireforming loads have been as good or better vertical precision as the trimmed full power loads.
taylor
Reply with quote  #19 
flybuster i made my own dies ,wilson seater and newlon full length sizer,
i fully prep my brass first ,then fireform on full power loads
at a match the accuracy is awsome ,spreads are slightly higher than second firing ,but good enough to win matches
Grant Taylor
AlanPF
Reply with quote  #20 
What do 284 chamberings generally do about neck size with Lapua brass? I am considering a .316" chamber neck (BTW what is standard neck size?). I read that its best to have at least 0.002" per side neck clearance i.e. .312" loaded round, which is 0.013" neck thickness. The brass I have has about .015" neck thickness, so that would mean turning .002". Does this sound reasonable? Or would a no turn neck be okay?

Any advice appreciated.

Alan
TonyR
Reply with quote  #21 
I am using expanded Lapua brass. My chamber is 0.313 inches and my loaded neck is 0.310 inches. I have to take a full cut to get the expanded necks down to this dimension with my lots of brass.
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