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Rifles, Reloading, Optics, Equipment
Reloading
Neck Sizing Vs. Full Length Sizing and Neck Tension
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<blockquote data-quote="Buck Fever" data-source="post: 2765914" data-attributes="member: 113501"><p>Spring back happens as soon as you remove the die from the case, not over days.</p><p></p><p>Conventional neck sizing in a full length die does size the neck too small and then expand it back with the neck expander on the decapping stem as it pulls out of the sized case.</p><p></p><p>A collet neck sizer has a mandrel that sets neck tension and the collet forms the neck around the mandrel. This also sets the neck concentricity and pushes any neck thickness variation to the outside of the neck. The thing to understand is this only undersizes the case neck minimally, by the expected amount of spring back (which happens essentially instantly when your collet die unlocks).</p><p></p><p>So bumping the shoulder just enough for easy chambering and collet neck sizing is how you resize with the minimal amount of brass working and thus work hardening.</p><p></p><p>Do that with neck turned brass, a tight chamber, annealing every time, case length trimming and sorting to have pretty much benchrest level brass prep.</p><p></p><p>Additional steps are depriming and cleaning before sizing. Some people ream primer pockets but some people say that messes them up if you are starting with Lapua brass.</p><p></p><p>Minimal brass working is a logical goal for precision reloading but to get that you need to understand every process that's happening both when you fire and when you reload.</p></blockquote><p></p>
[QUOTE="Buck Fever, post: 2765914, member: 113501"] Spring back happens as soon as you remove the die from the case, not over days. Conventional neck sizing in a full length die does size the neck too small and then expand it back with the neck expander on the decapping stem as it pulls out of the sized case. A collet neck sizer has a mandrel that sets neck tension and the collet forms the neck around the mandrel. This also sets the neck concentricity and pushes any neck thickness variation to the outside of the neck. The thing to understand is this only undersizes the case neck minimally, by the expected amount of spring back (which happens essentially instantly when your collet die unlocks). So bumping the shoulder just enough for easy chambering and collet neck sizing is how you resize with the minimal amount of brass working and thus work hardening. Do that with neck turned brass, a tight chamber, annealing every time, case length trimming and sorting to have pretty much benchrest level brass prep. Additional steps are depriming and cleaning before sizing. Some people ream primer pockets but some people say that messes them up if you are starting with Lapua brass. Minimal brass working is a logical goal for precision reloading but to get that you need to understand every process that's happening both when you fire and when you reload. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck Sizing Vs. Full Length Sizing and Neck Tension
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