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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Full Length or Neck Only; What's Best Resizing for Accuracy?
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<blockquote data-quote="Bart B" data-source="post: 1803584" data-attributes="member: 5302"><p>A 30 caliber cartridge whose bullet needs 10 pounds of push force to start it moving forward in the case neck needs about 130 psi in the case to start with. Bullet cross section area is about 1/13th square inch, force on bullet = 1/13th of 130 psi. Not near enough to fully expand the case to chamber limits.</p><p></p><p>As soon as the bullet starts into the rifling, several dozen pounds of force are needed to fully engrave the bullet. That's several hundred psi.</p><p></p><p>In my 308 Win tests, powder charges 15% or more less than maximum ended up with case headspace .002" to .007" less after firing. Primers were backed out about that much past flush with case heads. Shoulders were set back that far from firing pin impact. Case was smaller than chamber.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1803584, member: 5302"] A 30 caliber cartridge whose bullet needs 10 pounds of push force to start it moving forward in the case neck needs about 130 psi in the case to start with. Bullet cross section area is about 1/13th square inch, force on bullet = 1/13th of 130 psi. Not near enough to fully expand the case to chamber limits. As soon as the bullet starts into the rifling, several dozen pounds of force are needed to fully engrave the bullet. That's several hundred psi. In my 308 Win tests, powder charges 15% or more less than maximum ended up with case headspace .002" to .007" less after firing. Primers were backed out about that much past flush with case heads. Shoulders were set back that far from firing pin impact. Case was smaller than chamber. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Full Length or Neck Only; What's Best Resizing for Accuracy?
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