New Lapua, Nosler, and Alpha brass run out.
I just checked all three of these after running them over a Sinclair expander mandrel. All are good, but not the same. Lapua has 0.002, Nosler 0.001, and Alpha 0.000. All my new domestic brass is sealed in bags so I didn’t run any of that, but from experience it might be closer to 0.004. Not that this tells us much, but it is a comparison that can be measured.
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So Chuck, can you tell if the run out is caused by variance in neck wall thickness at different points on the neck or is it the neck isn't perfectly straight and has a small tilt to it?
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I’m almost certain that neck thickness is uniform. On Winchester or Remington brass the opposite is true.
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What is the effect of the expander mandrel? Can it impact run out?
Honest question. I've never seen one. Sent from my SM-N920W8 using Tapatalk |
The Mandrel, in this case, will reduce any run out due to a damaged neck. The mandrel floats, so it should not induce stress. Alpha brass is packed in such a way that necks are not damaged and there is no difference in run out before and after.
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Does anyone have different results? |
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