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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: 1804090" data-attributes="member: 5302"><p>I don't think so.</p><p></p><p>The head of a rimless bottleneck case is seldom, if ever, centered on the bolt face when the round fires. Extractors often push case bodies off center against the chamber, Their diameters at that point are smaller than the chamber.</p><p></p><p>But case position is very repeatable from shot to shot. Accuracy is good. A perfectly straight 308 Win cartridge with its head .001" off center in the chamber will put its bullet tip about .0007" off bore center in the opposite direction. The case pivots on its shoulder in the chamber shoulder.</p><p></p><p>New 308 Winchester cases with a 3/10 grain spread of IMR4895 under Sierra's 155 grain bullets having .003" runout tested 2.7 inches with 20 shots at 600 yards. In the first match with that new bullet in ammo loaded on two Dillon 1050 progressive's, a couple dozen top ranked long range competitors said it shot about 3 inches at 600. I had the high 4 day aggregate score shooting 600, 800, 900 and 1000 yards using metallic sights.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1804090, member: 5302"] I don't think so. The head of a rimless bottleneck case is seldom, if ever, centered on the bolt face when the round fires. Extractors often push case bodies off center against the chamber, Their diameters at that point are smaller than the chamber. But case position is very repeatable from shot to shot. Accuracy is good. A perfectly straight 308 Win cartridge with its head .001" off center in the chamber will put its bullet tip about .0007" off bore center in the opposite direction. The case pivots on its shoulder in the chamber shoulder. New 308 Winchester cases with a 3/10 grain spread of IMR4895 under Sierra's 155 grain bullets having .003" runout tested 2.7 inches with 20 shots at 600 yards. In the first match with that new bullet in ammo loaded on two Dillon 1050 progressive's, a couple dozen top ranked long range competitors said it shot about 3 inches at 600. I had the high 4 day aggregate score shooting 600, 800, 900 and 1000 yards using metallic sights. [/QUOTE]
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Full Length or Neck Only; What's Best Resizing for Accuracy?
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