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Rifles, Reloading, Optics, Equipment
Reloading
Chamber pressures
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<blockquote data-quote="nanuk-O-da-Nort" data-source="post: 749809" data-attributes="member: 27059"><p>My comment was about your first paragraph, which does not appear to be correct and is somewhat misleading regarding pressure/seating depth. I just wanted to show that others found the opposite.</p><p>Now, perhaps you have done your own pressure trace tests, I don't know, but if you are just repeating "Conventional Wisdom" then that is more like an ol' wive's tale, and needs to be challenged so we can all learn.</p><p></p><p>regarding "Donuts" I do believe you on that, but only so far as there could be no room for release of the bullet, as the brass could be jammed in the neck clamping down on the bullet.</p><p></p><p>regarding chamber pressures, I think of it this way, the bullet has little to do with pressure until it encounters the rifling. A bullet is only a fraction of a pound, yet chamber pressures are measured in Kilopounds.</p><p></p><p>when seated deep, as long as it doesn't compress the powder (as that IS known to alter the burning characteristics) the bullet is not an obstruction, and moves very easily.</p><p></p><p>When it hits the rifling, pressures rise as it overcomes the resistance of bullet/rifling/bore.</p><p></p><p>a bullet that has a running start requires far less pressure to force it into the bore. I believe P.O.Ackley proved that out. </p><p></p><p>now jam that bullet INTO the bore, and you have to overcome the rifling with much greater force.</p><p></p><p>I used to know what/why this was. Modulus of elasticity or something else with a foreign sounding name.</p><p></p><p>I believe it is the same theory is behind breaking a thread with your hand... pull it slow and it will cut to the bone. Give it a snap and it will break easy.</p></blockquote><p></p>
[QUOTE="nanuk-O-da-Nort, post: 749809, member: 27059"] My comment was about your first paragraph, which does not appear to be correct and is somewhat misleading regarding pressure/seating depth. I just wanted to show that others found the opposite. Now, perhaps you have done your own pressure trace tests, I don't know, but if you are just repeating "Conventional Wisdom" then that is more like an ol' wive's tale, and needs to be challenged so we can all learn. regarding "Donuts" I do believe you on that, but only so far as there could be no room for release of the bullet, as the brass could be jammed in the neck clamping down on the bullet. regarding chamber pressures, I think of it this way, the bullet has little to do with pressure until it encounters the rifling. A bullet is only a fraction of a pound, yet chamber pressures are measured in Kilopounds. when seated deep, as long as it doesn't compress the powder (as that IS known to alter the burning characteristics) the bullet is not an obstruction, and moves very easily. When it hits the rifling, pressures rise as it overcomes the resistance of bullet/rifling/bore. a bullet that has a running start requires far less pressure to force it into the bore. I believe P.O.Ackley proved that out. now jam that bullet INTO the bore, and you have to overcome the rifling with much greater force. I used to know what/why this was. Modulus of elasticity or something else with a foreign sounding name. I believe it is the same theory is behind breaking a thread with your hand... pull it slow and it will cut to the bone. Give it a snap and it will break easy. [/QUOTE]
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