Mikecr
Well-Known Member
Sure it does, you only need to examine the test for validity.I don't think case neck spring back has much to do with case hardness.
How do you know the case necks were 'harder'? I personally doubt it.benchresters used to turn their brass (tight neck chamber) so they didn't have to re-size the neck until they needed to move the shoulder back. I know for a fact the case neck is a lot harder after 5 plus firings yet the neck spring back was the same.
I currently run with tight clearances on a couple cartridges(one is fitted), and I also measure seating forces with an instrumented mandrel. What I see is that necks that do not require neck sizing to reload(they spring right back to dimension), never change in hardness.
Necks do not thicken with firing, but with your FL sizing.What tends to complicate the issue is the neck thicken over several firings and this will start creating different spring back until the necks are turned back to spec.
Stop FL sizing, and necks remain stable in thickness. No donuts forming, no reaming needed, and no more trimming.
I've burned out a couple barrels now with a small lot of brass(>30 reloads) and my originally turned necks have never changed a bit. This in 6.5WSSM. I've never had to re-turn necks in 223, 6br, or 6xc either.
It's because I don't ever FL size.
How do I do this when seemingly everyone says I have to FL size?
They're wrong.
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