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Rifles, Reloading, Optics, Equipment
Reloading
SIMPLE question on neck tension
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<blockquote data-quote="Mikecr" data-source="post: 1842563" data-attributes="member: 1521"><p>You're right in that it isn't rocket science, but your notion here is wrong. What you're describing is a common 'interference', which is different and independent of 'tension'..</p><p></p><p>Neck tension is spring back FORCE available to grip an AREA of seated bullet bearing.</p><p>It's unit of measure, if we did so, would be pounds per square inch (psi).</p><p>We adjust tension through spring back force(like with annealing), and area of grip(length of neck sizing and seating depth). If you think otherwise -you're wrong.</p><p></p><p>While neck sizing length is within seated bearing length, a setting of neck interference beyond full spring back(~1thou), provides nothing further for bullet grip. All you're doing with that is forcing seated bullets to expand necks to what they will be regardless. In other words, it matters not whether we pre-seat expand necks with a mandrel, or expand just the same with bullets.</p><p>The only thing holding that bullet bearing is the force provided by neck spring back, which is freely ~1thou max, for a portion of or full seated bearing length.</p><p></p><p>What this means is that if you set sized/sprung back necks, which are of normal hardness, to 1thou interference, for the full length of seated bearing, you have set maximum<em> controlled </em>neck tension.</p><p>Now, if you chose to size a length exceeding seated bearing, or including shoulder/donut in tension. then you get into <em>uncontrolled</em> tension. This is way higher, and varies a great deal. Nobody should ever do this.</p><p></p><p>On seating forces varying with neck hardness, friction, and expansion force, this means nothing directly about tension, and so it does not directly affect muzzle velocities/pressure.</p><p>To use seating force for comparative tension indication, you have to first normalize friction and seating expansion.</p><p>This, isolating neck hardness (force) and seating length (area) for indication.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1842563, member: 1521"] You're right in that it isn't rocket science, but your notion here is wrong. What you're describing is a common 'interference', which is different and independent of 'tension'.. Neck tension is spring back FORCE available to grip an AREA of seated bullet bearing. It's unit of measure, if we did so, would be pounds per square inch (psi). We adjust tension through spring back force(like with annealing), and area of grip(length of neck sizing and seating depth). If you think otherwise -you're wrong. While neck sizing length is within seated bearing length, a setting of neck interference beyond full spring back(~1thou), provides nothing further for bullet grip. All you're doing with that is forcing seated bullets to expand necks to what they will be regardless. In other words, it matters not whether we pre-seat expand necks with a mandrel, or expand just the same with bullets. The only thing holding that bullet bearing is the force provided by neck spring back, which is freely ~1thou max, for a portion of or full seated bearing length. What this means is that if you set sized/sprung back necks, which are of normal hardness, to 1thou interference, for the full length of seated bearing, you have set maximum[I] controlled [/I]neck tension. Now, if you chose to size a length exceeding seated bearing, or including shoulder/donut in tension. then you get into [I]uncontrolled[/I] tension. This is way higher, and varies a great deal. Nobody should ever do this. On seating forces varying with neck hardness, friction, and expansion force, this means nothing directly about tension, and so it does not directly affect muzzle velocities/pressure. To use seating force for comparative tension indication, you have to first normalize friction and seating expansion. This, isolating neck hardness (force) and seating length (area) for indication. [/QUOTE]
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SIMPLE question on neck tension
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