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Rifles, Reloading, Optics, Equipment
Reloading
Trimming tips?
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<blockquote data-quote="Mikecr" data-source="post: 2637383" data-attributes="member: 1521"><p>A lot of people think that for turning necks, they should be trimmed first, for a consistent stop on the turning tool.</p><p>Alot of people assume that trimming to the shortest in the box is a consistent and good thing.</p><p>Neither is true.</p><p></p><p>Necks should be turned when new. But at that point the neck-shoulder junctions are not consistent, so you should not employ a set & forget setting. You should apply a visual/hand touching of cutter to neck-shoulder junction. It's not a critical cut there (as long as you don't go crazy with it). It's just a mitigation of donuts.</p><p></p><p>Also, necks typically pull back with fire forming. This, because improving of shoulders to any slightly higher angle will pull necks back.</p><p>So if you had already trimmed to desired clearance, then with fire forming the clearance will open beyond desired.</p><p>You can instead measure your chamber length, log it, measure your new cases, and with any that are too long (or leaving the pack), toss them.</p><p>Then after fully fire forming brass to stable, consider if trimming is needed yet, or ever.</p><p>Why would you want to toss cases that are different in length than the others? Because they're different in other ways too. Just do it,, brass is cheaper than bad reloading.</p><p>If all new cases are long for your chamber, then trim to around 5thou short of chamber end (allowing for excess headspace), keeping in mind that this clearance will likely grow on 1st firing.</p><p></p><p>So why would trim length variance not be a priority concern?</p><p>Because a hair length one way or another of neck comes nowhere near the tension variances you will have -no matter what.</p><p>It's totally lost in the noise.</p><p>It's more important to get close on chamber end clearance, to keep that sooty gas from getting between necks and chamber.</p><p>A far bigger affect.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2637383, member: 1521"] A lot of people think that for turning necks, they should be trimmed first, for a consistent stop on the turning tool. Alot of people assume that trimming to the shortest in the box is a consistent and good thing. Neither is true. Necks should be turned when new. But at that point the neck-shoulder junctions are not consistent, so you should not employ a set & forget setting. You should apply a visual/hand touching of cutter to neck-shoulder junction. It's not a critical cut there (as long as you don't go crazy with it). It's just a mitigation of donuts. Also, necks typically pull back with fire forming. This, because improving of shoulders to any slightly higher angle will pull necks back. So if you had already trimmed to desired clearance, then with fire forming the clearance will open beyond desired. You can instead measure your chamber length, log it, measure your new cases, and with any that are too long (or leaving the pack), toss them. Then after fully fire forming brass to stable, consider if trimming is needed yet, or ever. Why would you want to toss cases that are different in length than the others? Because they're different in other ways too. Just do it,, brass is cheaper than bad reloading. If all new cases are long for your chamber, then trim to around 5thou short of chamber end (allowing for excess headspace), keeping in mind that this clearance will likely grow on 1st firing. So why would trim length variance not be a priority concern? Because a hair length one way or another of neck comes nowhere near the tension variances you will have -no matter what. It's totally lost in the noise. It's more important to get close on chamber end clearance, to keep that sooty gas from getting between necks and chamber. A far bigger affect. [/QUOTE]
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