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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension
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<blockquote data-quote="tdot" data-source="post: 1725022" data-attributes="member: 91330"><p>But at the end of the day, this thread is about neck tension. While I agree that the terminology may be incorrect we are not technically measuring tension, when we measure the OD change of the brass.</p><p></p><p>What I will suggest is that using our commonly available tools, measuring the change in OD is one of our best ways to repeatedly replicate the force that is applied to the bullet. Testing should be done by each individual to find what works best for them and their loading process to obtain repeatable results in their gun, with their ammo in their conditions. It is up to the user whether they can consistently repeat that loading process and therefore replicate their results.</p><p></p><p>And while people may not specifically speak of brass density, neck thickness, the coefficient of friction of the interior of the neck, the coefficient of friction of the bullet, or any of the other possible variables. If all of the potential variables are repeated and consistent, then the "neck tension" can be inferred from the change in the "neck diameter".</p><p></p><p>If we all really wanted to get pedantic, then we could also talk about the fact that a .264 neck has a tighter arc then a .375 neck or even a .30 neck. Therefore there is inherently more strength to that arc and more resistance to deformation. (Think bridge building, and also the arc of a leaf spring). And there are many more examples of the minutiae that we could discuss.</p><p></p><p>All things that we can't readily measure.</p><p></p><p>So for now I'll continue to measure neck OD and replicate my loads based on that. Whether it actually measures tension or not, it is repeatable, and that is the important part to me. And likely the reason that the herd uses the method.</p><p></p><p>If someone can come up with a better mouse trap, then I'm all ears.</p><p></p><p>PS. No disrespect intended, though I think I might be borderline.</p></blockquote><p></p>
[QUOTE="tdot, post: 1725022, member: 91330"] But at the end of the day, this thread is about neck tension. While I agree that the terminology may be incorrect we are not technically measuring tension, when we measure the OD change of the brass. What I will suggest is that using our commonly available tools, measuring the change in OD is one of our best ways to repeatedly replicate the force that is applied to the bullet. Testing should be done by each individual to find what works best for them and their loading process to obtain repeatable results in their gun, with their ammo in their conditions. It is up to the user whether they can consistently repeat that loading process and therefore replicate their results. And while people may not specifically speak of brass density, neck thickness, the coefficient of friction of the interior of the neck, the coefficient of friction of the bullet, or any of the other possible variables. If all of the potential variables are repeated and consistent, then the "neck tension" can be inferred from the change in the "neck diameter". If we all really wanted to get pedantic, then we could also talk about the fact that a .264 neck has a tighter arc then a .375 neck or even a .30 neck. Therefore there is inherently more strength to that arc and more resistance to deformation. (Think bridge building, and also the arc of a leaf spring). And there are many more examples of the minutiae that we could discuss. All things that we can't readily measure. So for now I'll continue to measure neck OD and replicate my loads based on that. Whether it actually measures tension or not, it is repeatable, and that is the important part to me. And likely the reason that the herd uses the method. If someone can come up with a better mouse trap, then I'm all ears. PS. No disrespect intended, though I think I might be borderline. [/QUOTE]
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