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Neck turning Question

5mmgunguy
If I neck turn does it all have to be shiney...turned it all. Or is it ok to have a small spot or two where it isn't shiney.
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3 comments

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  • 20gabob
    A few small spots will not hurt anything as long as they are really small. If you go foe all shiney you will probably ruin a lot of brass just tryin to make it look shiney. Just needs to be under SAAMI specs on the neck size, but barely so.
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  • zimmden
    The thinner spots of the case neck will not be cut if you turn off .001 to .002. This will be OK if you are just trying to make the necks more concentric and more uniform from case to case. Tight necks on benchrest gun chambers require turning necks to .008 to .009 in some cases. Most cases come with brass thickness of .012 to .015. If you do not use neck bushings to resize, you may not get enough squeeze to hold the bullets on necks turned to .008 to .009. A ball neck micrometer is essential before, during and after neck turning. A dial caliper can be used but is not quite as accurate. The shiney portion of course will be the thicker brass removed.
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  • nononsense
    5mmgunguy,

    Check your e-mail.

    Minimum neck turning should leave small areas of the case neck untouched because you are removing just the thicker brass to get the wall thickness consistent. This will be what you should encounter in most situations.

    Some accuracy folks like a neck which is slightly tighter or smaller in diameter than what SAAMI specs call for or what we are given by the factory. In this situation you need to have (know) the dimension of the chamber neck so you can turn the neck wall thickness properly and safely. Cases for tight neck cartridges are usually 'shiny' completely around the neck because you are reducing the diameter (OD) more. As an aside, this tight neck dimension should be stamped or marked on the barrel by the gunsmith or the rifle owner as a 'just in case' precaution.

    I don't own any factory barreled rifles anymore so I neck turn all of my brass for minimum clean up. This includes Lapua and Norma as well. Yes, even they need a little attention no matter what some folks think...

    It's a nuisance process but one that can improve shot-to-shot consistency over the long run. It's a finesse for the more advanced shooters which can be ignored by the hunters and plinkers.

    Best.
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