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Rifles, Reloading, Optics, Equipment
Reloading
Pressure changes with seating depth
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<blockquote data-quote="Nimrodmar10" data-source="post: 1751789" data-attributes="member: 36369"><p>I think your scenario is actually combining two issues at the same time; seating depth and jump/jam. If you separate the two issues it will be a little easier to answer the question. Seating the bullet to a longer cartridge length will lower the pressure, to a point. Seating a bullet into the Lands will raise the pressure, but may improve you accuracy with certain bullets. But in your case if pressure is already near max, and if you are .050" off the lands and then try to seat to the lands, you are probably going to see a spike on pressure. Now if you were .150" off the lands and seated .050" longer, it would decrease your pressure because this would give you more relative case capacity. But when that same .050" increase puts your bullet into contact with the Lands, your pressure will increase. That's why SAAMI Standards were established, to set factory standards that would keep commercial ammo safe.</p><p>Now, that being said, the trend lately has been to use heavy for caliber bullets, seated longer than SAAMI specs, in chambers with throats cut longer to accept those long bullets and fast twist rates to spin and stabilize those long bullets. Where we get in trouble is when we try to use those long bullets in a standard chamber. To make them fit in the chamber, or magazine , we seat the bullet deeper into the powder space in the case.</p><p>I know I'm kind of rambling here, but what I'm trying to say is your weapon and ammo must be designed to all work together. If you're going to shoot something like the new Hornady 153 gr. A Tip bullet, you have to have a rifle designed for it.</p></blockquote><p></p>
[QUOTE="Nimrodmar10, post: 1751789, member: 36369"] I think your scenario is actually combining two issues at the same time; seating depth and jump/jam. If you separate the two issues it will be a little easier to answer the question. Seating the bullet to a longer cartridge length will lower the pressure, to a point. Seating a bullet into the Lands will raise the pressure, but may improve you accuracy with certain bullets. But in your case if pressure is already near max, and if you are .050" off the lands and then try to seat to the lands, you are probably going to see a spike on pressure. Now if you were .150" off the lands and seated .050" longer, it would decrease your pressure because this would give you more relative case capacity. But when that same .050" increase puts your bullet into contact with the Lands, your pressure will increase. That's why SAAMI Standards were established, to set factory standards that would keep commercial ammo safe. Now, that being said, the trend lately has been to use heavy for caliber bullets, seated longer than SAAMI specs, in chambers with throats cut longer to accept those long bullets and fast twist rates to spin and stabilize those long bullets. Where we get in trouble is when we try to use those long bullets in a standard chamber. To make them fit in the chamber, or magazine , we seat the bullet deeper into the powder space in the case. I know I'm kind of rambling here, but what I'm trying to say is your weapon and ammo must be designed to all work together. If you're going to shoot something like the new Hornady 153 gr. A Tip bullet, you have to have a rifle designed for it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Pressure changes with seating depth
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