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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: 1817874" data-attributes="member: 5302"><p>tim_w,</p><p></p><p>Full length sizing of bottleneck cases headspacing on their shoulders has been the norm for best accuracy in all rifles, especially match ones, since the late 1950's. Case necks are centered best on case shoulders when the round fires. Cases do not lay in the chamber bottom when their primer fires.</p><p></p><p>This assumes the bolt face is squared up to the chamber axis. Otherwise, new cases, which are full length sized, will typically produce best accuracy. A good example is best quality M1 and M14 match rifles shooting commercial match bullets from new cases testing about half MOA at 600 yards. Reloading those full length sized fired cases with out of square case heads produced ammo that tested up to 1 MOA bigger.</p><p></p><p>Commercial rifles seldom have squared up bolt faces.</p><p></p><p>Accuracy is best determined by the size of the largest groups because they show how far bullets go from point of aim when all the variables add up in one direction. Smallest groups fired happen when all those variables cancel each other out.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1817874, member: 5302"] tim_w, Full length sizing of bottleneck cases headspacing on their shoulders has been the norm for best accuracy in all rifles, especially match ones, since the late 1950's. Case necks are centered best on case shoulders when the round fires. Cases do not lay in the chamber bottom when their primer fires. This assumes the bolt face is squared up to the chamber axis. Otherwise, new cases, which are full length sized, will typically produce best accuracy. A good example is best quality M1 and M14 match rifles shooting commercial match bullets from new cases testing about half MOA at 600 yards. Reloading those full length sized fired cases with out of square case heads produced ammo that tested up to 1 MOA bigger. Commercial rifles seldom have squared up bolt faces. Accuracy is best determined by the size of the largest groups because they show how far bullets go from point of aim when all the variables add up in one direction. Smallest groups fired happen when all those variables cancel each other out. [/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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