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Long Range Hunting & Shooting
1000 yds...Next step?
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<blockquote data-quote="Bart B" data-source="post: 659866" data-attributes="member: 5302"><p>In response to my comments about proper full length sizing vs. neck only sizing aligning cases the same:Imagine a rimless bottleneck round whose body diameters are a few thousandths smaller than chamber diameters around it and its case headspace (head to shoulder datum) is 3 thousandths shorter than chamber headspace. The case neck's well centered on the case shoulder. And its neck diameter's several thousandths smaller than the chamber neck diameter. The case shoulder angle's within one degree of being the same as the chamber shoulder's angle.</p><p></p><p>Chamber that round in a rifle whose bolt has an in-line ejector in it such as Remington 700's or the push-feed Winchester 70's. That spring loaded ejector's going to push the round into the chamber until its shoulder stops against the chamber shoulder. There's plenty of clearance between the extractor lip and bolt face to allow this.</p><p></p><p>Where does the case shoulder align itself relative to the chamber shoulder?</p><p></p><p>If the action's a push feed Mauser style without the in-line ejector in the bolt face, where does the case shoulder align itself relative to the chamber shoulder when the firing pin drives the case forward as it impacts the primer?</p><p></p><p>For either ejector type, if the round's leade space (distance from case head to datum on the bullet's ogive at contact point with the lands in the barrel's leade) is 1 thousanths shorter than chamber leade space (bolt fact to the same datum diameter in the barrel's leade), where does the bullet center when the round's chambered as well as when it's fired?</p></blockquote><p></p>
[QUOTE="Bart B, post: 659866, member: 5302"] In response to my comments about proper full length sizing vs. neck only sizing aligning cases the same:Imagine a rimless bottleneck round whose body diameters are a few thousandths smaller than chamber diameters around it and its case headspace (head to shoulder datum) is 3 thousandths shorter than chamber headspace. The case neck's well centered on the case shoulder. And its neck diameter's several thousandths smaller than the chamber neck diameter. The case shoulder angle's within one degree of being the same as the chamber shoulder's angle. Chamber that round in a rifle whose bolt has an in-line ejector in it such as Remington 700's or the push-feed Winchester 70's. That spring loaded ejector's going to push the round into the chamber until its shoulder stops against the chamber shoulder. There's plenty of clearance between the extractor lip and bolt face to allow this. Where does the case shoulder align itself relative to the chamber shoulder? If the action's a push feed Mauser style without the in-line ejector in the bolt face, where does the case shoulder align itself relative to the chamber shoulder when the firing pin drives the case forward as it impacts the primer? For either ejector type, if the round's leade space (distance from case head to datum on the bullet's ogive at contact point with the lands in the barrel's leade) is 1 thousanths shorter than chamber leade space (bolt fact to the same datum diameter in the barrel's leade), where does the bullet center when the round's chambered as well as when it's fired? [/QUOTE]
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