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new brass - Old Jim - 05-26-2014
My question for today:
New brass, as in unfired, when ran thru the sizing-die I use for fired cases, is untouched by the die, save the first 0.30" of the case. Yet when fired using the same load as in the fire-formed cases, the groups are lousy ... 4-5" groups @ 200, as against 2" groups from the fire-formed ammo.
Any suggestions as to why this is?
I probably knew at one time, but you know how old brain-cells get
!
RE: new brass - powderburner - 05-26-2014
they are not laying level in the chamber?
RE: new brass - bruce moulds - 05-26-2014
powder compression is different using the same charge due to smaller internal capacity of new brass?
different neck tension?
anything you haven't told us?
keep safe,
bruce.
RE: new brass - Lumpy Grits - 06-02-2014
Dis is why we fire-form new cases.
LG
RE: new brass - Old Jim - 06-02-2014
Bruce is close on that one; different compression from one loaded round to another, I think.
Always good to hear from Lumpy on the hard ones
!Jim