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Rifles, Reloading, Optics, Equipment
Reloading
Setting neck tension with expander mandrel and bushing die questions
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<blockquote data-quote="sedancowboy" data-source="post: 2102164" data-attributes="member: 85874"><p>Not wanting to start a war but how does measuring seating force have any effect on bullet tension as it is released in a firing cycle. Just because you can buy measuring devices to measure seating force has no bearing on the amount of resistance the bullet will have upon release.</p><p>I will explain my thinking. As you increase the interference fit of bullet to neck beyond the yield point of the brass you are only using the bullet as a swage or mandrel instead of increasing the friction fit of the bullet to neck. You are also increasing the risk of deforming the bullet when seating force rises above the yield point of the brass. There is a reason most factory ammo crimps their bullets in place because delaying the bullet release increases ignition consistency. </p><p>I have fired ammo that had cold welded the bullet to the brass and noticed a increase in velocity. Break the cold weld by bumping the bullet with a seating die and there is a audible click as the bullet releases from the brass and the ammo will return to previous velocities. </p><p>I am not aware of a way for us to measure the force required for a bullet to be released from a loaded cartridge case in the firing sequence. Even if we could measure the amount of force required to pull the bullet from the case it is not relevant because the bullet is pushed from the rear by the powder gases.</p><p>Over the last 52 years that I have been reloading the most important thing I have learned is that consistency is most important to precision shooting. If you clean necks clean them all the same, if you turn necks turn them all the same. A .001-.002 interference fit is all that is needed anything beyond that you you are simply swaging brass when you seat the bullet. </p><p>My shooting precision improved most when I combined turning necks and annealing every time I reload a case. I found that every time a case is reloaded the neck tension changes if it is not annealed.</p></blockquote><p></p>
[QUOTE="sedancowboy, post: 2102164, member: 85874"] Not wanting to start a war but how does measuring seating force have any effect on bullet tension as it is released in a firing cycle. Just because you can buy measuring devices to measure seating force has no bearing on the amount of resistance the bullet will have upon release. I will explain my thinking. As you increase the interference fit of bullet to neck beyond the yield point of the brass you are only using the bullet as a swage or mandrel instead of increasing the friction fit of the bullet to neck. You are also increasing the risk of deforming the bullet when seating force rises above the yield point of the brass. There is a reason most factory ammo crimps their bullets in place because delaying the bullet release increases ignition consistency. I have fired ammo that had cold welded the bullet to the brass and noticed a increase in velocity. Break the cold weld by bumping the bullet with a seating die and there is a audible click as the bullet releases from the brass and the ammo will return to previous velocities. I am not aware of a way for us to measure the force required for a bullet to be released from a loaded cartridge case in the firing sequence. Even if we could measure the amount of force required to pull the bullet from the case it is not relevant because the bullet is pushed from the rear by the powder gases. Over the last 52 years that I have been reloading the most important thing I have learned is that consistency is most important to precision shooting. If you clean necks clean them all the same, if you turn necks turn them all the same. A .001-.002 interference fit is all that is needed anything beyond that you you are simply swaging brass when you seat the bullet. My shooting precision improved most when I combined turning necks and annealing every time I reload a case. I found that every time a case is reloaded the neck tension changes if it is not annealed. [/QUOTE]
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Setting neck tension with expander mandrel and bushing die questions
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