redding small base die info

[dave338]

Hi all
Being using a small base die for a .308 with a tight chamber
heres some specs from the brass
new lapua fired/sized with normal die sb die
headspace= 1.618 1.615 1.620
shoulder dia= .450 .453 .450
base of body dia= .465 .469 .465

hs measured using the hornaday guage.
whilst this is not definitive it does show that tha sb die seems to be returning the fired cases back closer to factory spec than a stardard die, especially on the body dia.
It had been suggested that the sb die would reduce the case a lot smaller than factory, in this instance not the result i found, i would suggest that brass from unknown sources should be sized with a sb die.
dies used were redding body only ones

 

[9H_Cracka]

Re: redding small base die info

Per SAAMI spec, you need to measure the base dimension at .200" above the base of the rim.

Please re-measure and post that number, both fired and sized, and I'll post mine for same fired in a minimum spec chamber.

My base diameter changes .002" from fired to sized BTW measured .200" above the rim with the Redding small base S die full length sizer.

 

[dave338]

Re: redding small base die info

that is per sammi spec

 

[turbo54]

Re: redding small base die info

I've found a SB die is pretty much <span style="font-style: italic">required</span> to reclaim brass from a SAAMI(ish) chamber, for use in a match-type chamber.

I was given several hundred pcs of 284 brass accumulated over 40 years of hunting. All 1x, fired from a Winchester 88.

There was no chance in hell it was going into my chamber without first being SB FLS'd.