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Rifles, Reloading, Optics, Equipment
Reloading
To bush or mandrel
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<blockquote data-quote="Mikecr" data-source="post: 2133154" data-attributes="member: 1521"><p>Mike, you'll be better to turn necks at NEW-NATIVE cal. With this you get best turning mandrel fit, and you won't need to turn onto neck-shoulder junction, as sizing down to 24cal will put some of the turned neck into new shoulder. Just turn full length of 28cal necks and size down to 24cal.</p><p>This is will be trial & error, so work into desired with cases culled for issues (like thickness variance). Should only take a few.</p><p></p><p>Lonewolf74, your thinking is same as mine. I really wish we had a way to measure this tension, which is really hoop tension.</p><p>I do know it's way more complicated than simple interference assumptions.</p><p>You have:</p><p>Where your putting yourself on the specific brass alloy stress-strain curve</p><p>The granular structure at any given reloading cycle</p><p>The diameter/area of the hoop</p><p>The length/area of sized, springing back against seated bullet bearing</p><p>The shoulder angle resisting through at least the donut area of neck length</p><p>The thickness of necks</p><p></p><p>I'll add, the biggest misunderstanding folks latch onto is a notion of 'pull force'. That tension is somehow friction.</p><p><u>It is not</u>, and easy enough to prove it is not, so those people are truly lost in this.</p><p>Our bullets are released and swinging in the wind, as pressure X area of the charge expands neck/shoulder but a relative few molecules worth of clearance. It takes only a tiny portion of pressure peak to do this -very quickly.</p><p>Understanding this will lead you to see and use neck tension as a FINE tuning adjustment.</p><p>If needing extremes here to reach a 'good' load, then it's not such a good load. The bullet/cartridge/load is wrong somewhere.</p><p>A normal spring back force X area gripping is plenty of adjustment.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2133154, member: 1521"] Mike, you'll be better to turn necks at NEW-NATIVE cal. With this you get best turning mandrel fit, and you won't need to turn onto neck-shoulder junction, as sizing down to 24cal will put some of the turned neck into new shoulder. Just turn full length of 28cal necks and size down to 24cal. This is will be trial & error, so work into desired with cases culled for issues (like thickness variance). Should only take a few. Lonewolf74, your thinking is same as mine. I really wish we had a way to measure this tension, which is really hoop tension. I do know it's way more complicated than simple interference assumptions. You have: Where your putting yourself on the specific brass alloy stress-strain curve The granular structure at any given reloading cycle The diameter/area of the hoop The length/area of sized, springing back against seated bullet bearing The shoulder angle resisting through at least the donut area of neck length The thickness of necks I'll add, the biggest misunderstanding folks latch onto is a notion of 'pull force'. That tension is somehow friction. [U]It is not[/U], and easy enough to prove it is not, so those people are truly lost in this. Our bullets are released and swinging in the wind, as pressure X area of the charge expands neck/shoulder but a relative few molecules worth of clearance. It takes only a tiny portion of pressure peak to do this -very quickly. Understanding this will lead you to see and use neck tension as a FINE tuning adjustment. If needing extremes here to reach a 'good' load, then it's not such a good load. The bullet/cartridge/load is wrong somewhere. A normal spring back force X area gripping is plenty of adjustment. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
To bush or mandrel
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