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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension
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<blockquote data-quote="MagnumManiac" data-source="post: 2217829" data-attributes="member: 10755"><p>I'll give you a hint of WHY what we do in regard to IF changes with length of neck sizing, it is the AMOUNT of friction on bullet release.</p><p>Factory ammo is crimped because they use a fast powder to save cost and you will notice a lot of air space. This crimp has been used for decades because it raises start pressure to a level that would be found with a slower powder without the crimp.</p><p>This is why a change in FRICTION, either from a crimp, or neck IF, can drastically alter a loads parameters, as does seating depth.</p><p>IF stays the same, about .001", on the bullet shank, but changing it's length is like fine tuning it, as Mikecr refers to.</p><p>I have only ever gone to half bullet OD in IF length on 22 cal, everything else I load for is maybe 70% minimum.</p><p>It was once thought that a long neck was conducive to accuracy, this has been debunked over and over, as many rounds these days have less than OD cal necks and are exceptionally accurate.</p><p>If you seat into the rifling, or the same amount from it, the only way to tune is with primer/powder and IF length.</p><p>Hope this makes sense.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2217829, member: 10755"] I’ll give you a hint of WHY what we do in regard to IF changes with length of neck sizing, it is the AMOUNT of friction on bullet release. Factory ammo is crimped because they use a fast powder to save cost and you will notice a lot of air space. This crimp has been used for decades because it raises start pressure to a level that would be found with a slower powder without the crimp. This is why a change in FRICTION, either from a crimp, or neck IF, can drastically alter a loads parameters, as does seating depth. IF stays the same, about .001”, on the bullet shank, but changing it’s length is like fine tuning it, as Mikecr refers to. I have only ever gone to half bullet OD in IF length on 22 cal, everything else I load for is maybe 70% minimum. It was once thought that a long neck was conducive to accuracy, this has been debunked over and over, as many rounds these days have less than OD cal necks and are exceptionally accurate. If you seat into the rifling, or the same amount from it, the only way to tune is with primer/powder and IF length. Hope this makes sense. Cheers. [/QUOTE]
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