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1 Attachment(s)
i finally got round to shooting my .260 with some peterson brass and some more of the norma brass that is pinhole/splitting in the neck.
Fired brass in the chamber headspace comparative measures at 1.630"
The Peterson brass went mint, no splits/ issues. 5 pieces fired 3 times with stout loads. New length of 1.622" and then fired and sized h/s of 1.627".
The Norma i found was more prone to split when sized to 1.620" (by previous owner) on the first or second firing. When i sized them at 1.625-1.627" none appeared to have split.
So i'm putting the splitting down to excessive headspace and poor brass.
Attachment 230827
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Mine definitely isnt a headspace issue, ive been bumping the shoulder back a thou. Basically all of my lapua brass is wrecked now, slowly but surely the ones that were ok are now buggered. All i can put it down to is a bad batch of brass. Some of my creedmoor lapua brass has been punished pretty hard & all the necks are mint. Same loading processes.
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Yeah sorry I was implying that is the reason for my Norma brass splitting.
Yours definitely seems to be bad batch brass.
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I had some hornady that was splitting the same way.
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Just came across this while day dreaming.
I had the same issue. Was dirt in my chamber. Got it out with a pick.
Cheers
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hi have you tried factory loaded then 2 reloads with no alinealing to 5th reload
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Bugger my lapua has fallen apart as well. 5th firing I've got maybe a 70% cull rate from one session alone.
Been higher end loads over 5 firings so nothing to cry over but some of them look like Swiss cheese which is a bit alarming. I want to blame annealing but I anneal all cartridges I shoot.
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Have you got a ball mic like this . If you mount it in a small vice and make some tube spacers to fit over the fixed ball mandrel you can measure neck thickness at various points both around and up the neck. I wonder if the necks are on thin side (say well under 15 thou) not concentric or even tapered?
