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Rifles, Reloading, Optics, Equipment
Reloading
New to mandrel expanders have questions
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<blockquote data-quote="Mikecr" data-source="post: 1842306" data-attributes="member: 1521"><p>With necks sized no longer than seated bearing, any interference beyond spring back, which is no way over 1thou, means nothing. This, because the bullet will just size back up on seating.</p><p></p><p>Try it yourself. Measure neck OD before seating, seat a bullet, measure neck OD again, pull the bullet, measure what neck OD springs back to. It's no more than 1thou smaller than seated OD. That's all you get.</p><p>You could size necks down 5thou for what you 'think' is tension. Nope. Does the same thing, and that is in no way what 'tension' is.</p><p></p><p>With partial sized necks it don't matter to tension if you size down 1thou or 10thou. Here, what matters(how tension is adjusted) is the <strong>length</strong> of sizing. Spring back force x area applied [PSI].</p><p>With necks sized in length beyond seated bearing(like FL sized) it matters, and it sucks completely, because tension goes all over the map. This because that spring back force is then binding to the bullet's base-bearing junction, and you've included donut and shoulder angle to release.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1842306, member: 1521"] With necks sized no longer than seated bearing, any interference beyond spring back, which is no way over 1thou, means nothing. This, because the bullet will just size back up on seating. Try it yourself. Measure neck OD before seating, seat a bullet, measure neck OD again, pull the bullet, measure what neck OD springs back to. It's no more than 1thou smaller than seated OD. That's all you get. You could size necks down 5thou for what you 'think' is tension. Nope. Does the same thing, and that is in no way what 'tension' is. With partial sized necks it don't matter to tension if you size down 1thou or 10thou. Here, what matters(how tension is adjusted) is the [B]length[/B] of sizing. Spring back force x area applied [PSI]. With necks sized in length beyond seated bearing(like FL sized) it matters, and it sucks completely, because tension goes all over the map. This because that spring back force is then binding to the bullet's base-bearing junction, and you've included donut and shoulder angle to release. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
New to mandrel expanders have questions
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