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Rifles, Reloading, Optics, Equipment
Reloading
Need guidance...case neck thickness
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<blockquote data-quote="epoletna" data-source="post: 1566440" data-attributes="member: 87371"><p>I use a 21st Century neck thickness trimmer. It is like a small lathe that you can attach an electric drill to, and by running the drill (at low speed) you push the case slowly onto the mandrel and trim the thickness and the neck/shoulder angle (if needed) in one cut. </p><p></p><p>It is perhaps overkill for what you are doing, but I shoot two calibers for which there were no commercial cases when I first started bench rest shooting, and if you neck a case up or down you will have case neck thickness issues. </p><p></p><p>It also trues the neck, making it the same thickness all the way around.</p><p></p><p>For the 21st Century, you need to outside size the case neck, then run an expanding mandrel into it, before you start the turning process. This gives you a consistent inside diameter. You must also have the correct size turning mandrel to push the case into in the trimmer, and I find a little Imperial Sizing wax on the mandrel makes the turning process easier.</p><p></p><p>But remember, you are squeezing the neck down in a resizing die (without a resizing button), then expanding it on an expanding mandrel, before turning it. That way you get a consistent inside neck diameter, which should give you a consistent neck tension on the bullet after you have turned the outside diameter.</p><p></p><p>As someone has already pointed out, you only need to do this once on each case.</p></blockquote><p></p>
[QUOTE="epoletna, post: 1566440, member: 87371"] I use a 21st Century neck thickness trimmer. It is like a small lathe that you can attach an electric drill to, and by running the drill (at low speed) you push the case slowly onto the mandrel and trim the thickness and the neck/shoulder angle (if needed) in one cut. It is perhaps overkill for what you are doing, but I shoot two calibers for which there were no commercial cases when I first started bench rest shooting, and if you neck a case up or down you will have case neck thickness issues. It also trues the neck, making it the same thickness all the way around. For the 21st Century, you need to outside size the case neck, then run an expanding mandrel into it, before you start the turning process. This gives you a consistent inside diameter. You must also have the correct size turning mandrel to push the case into in the trimmer, and I find a little Imperial Sizing wax on the mandrel makes the turning process easier. But remember, you are squeezing the neck down in a resizing die (without a resizing button), then expanding it on an expanding mandrel, before turning it. That way you get a consistent inside neck diameter, which should give you a consistent neck tension on the bullet after you have turned the outside diameter. As someone has already pointed out, you only need to do this once on each case. [/QUOTE]
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Need guidance...case neck thickness
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