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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: 1813580" data-attributes="member: 5302"><p>Sierra Bullets did a lot of testing in the 1950's with different fired bottle neck cases to see what resizing method produced best accuracy. They soon learned that the better centered case necks were on case shoulders, accuracy improved. They knew the case shoulder was hard pressed and centered in the chamber shoulder when fired. Often the case shoulder was set back a thousandth or two from firing pin impact before the round fired. Didn't matter if the case body diameters were reduced a couple thousandths because they didn't touch the chamber except at their pressure ring about a tenth inch in front of the case extractor groove.</p><p></p><p>Measuring case neck runout on cases neck relative to case shoulder, smallest runout happened when fired cases were resized in dies whose shoulder centered in the die shoulder making the neck well centered on the case shoulder. Didn't matter how much the case body diameters were reduced.</p><p></p><p>Ferris Pindell (PPC cartridge family co-founder) was a tool and die machinist at Sierra who championed this idea. It was soon part of the trend in benchrest disciplines moving away from neck only to full length resized cases.</p><p></p><p>Was most interesting that good quality new rimless bottleneck cartridge cases often had necks well centered on their shoulders and were more accurate than neck only resizing routines. All new cases are full length sized.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1813580, member: 5302"] Sierra Bullets did a lot of testing in the 1950's with different fired bottle neck cases to see what resizing method produced best accuracy. They soon learned that the better centered case necks were on case shoulders, accuracy improved. They knew the case shoulder was hard pressed and centered in the chamber shoulder when fired. Often the case shoulder was set back a thousandth or two from firing pin impact before the round fired. Didn't matter if the case body diameters were reduced a couple thousandths because they didn't touch the chamber except at their pressure ring about a tenth inch in front of the case extractor groove. Measuring case neck runout on cases neck relative to case shoulder, smallest runout happened when fired cases were resized in dies whose shoulder centered in the die shoulder making the neck well centered on the case shoulder. Didn't matter how much the case body diameters were reduced. Ferris Pindell (PPC cartridge family co-founder) was a tool and die machinist at Sierra who championed this idea. It was soon part of the trend in benchrest disciplines moving away from neck only to full length resized cases. Was most interesting that good quality new rimless bottleneck cartridge cases often had necks well centered on their shoulders and were more accurate than neck only resizing routines. All new cases are full length sized. [/QUOTE]
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Full Length or Neck Only; What's Best Resizing for Accuracy?
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