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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy=seating depth or tenths of powder
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<blockquote data-quote="Pdvdh" data-source="post: 1130125" data-attributes="member: 4191"><p>Test your theory while recording MV. Start with the bullet near the lands with a normal pressure rifle cartridge. Then increase jump to the lands with identical powder charges. Velocity will go down with increasing bullet jump (seating the bullet deeper in the casing). Or simple research further. It shouldn't be difficult to confirm this with the Google search tool.</p><p></p><p>I hear your thought process. It seems logical. But it neglects to include the pressure spike that occurs as the bullet enters the rifling. Muzzle velocity and pressure will be largest with the bullets jammed into the lands, because the additional friction required to start the jammed bullet will increase pressure substantially, compared to giving the bullet a friction free jump into motion before it enters the rifling. Higher pressure = higher MV.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1130125, member: 4191"] Test your theory while recording MV. Start with the bullet near the lands with a normal pressure rifle cartridge. Then increase jump to the lands with identical powder charges. Velocity will go down with increasing bullet jump (seating the bullet deeper in the casing). Or simple research further. It shouldn't be difficult to confirm this with the Google search tool. I hear your thought process. It seems logical. But it neglects to include the pressure spike that occurs as the bullet enters the rifling. Muzzle velocity and pressure will be largest with the bullets jammed into the lands, because the additional friction required to start the jammed bullet will increase pressure substantially, compared to giving the bullet a friction free jump into motion before it enters the rifling. Higher pressure = higher MV. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy=seating depth or tenths of powder
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