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Long Range Hunting & Shooting
reloading for accuracy questions
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<blockquote data-quote="Howland" data-source="post: 1373387" data-attributes="member: 103509"><p>Glad to see you here, Steve! Good to have you aboard.</p><p></p><p>I want to add a couple disclaimers to my reply in our conversation. </p><p></p><p>If you use Lee Collet dies, you are resizing the outside of the neck. Variation in neck wall thickness leads to variation in case neck tension, which leads to variation in muzzle velocity. Suboptimal. (I added that for the engineer that will always be within you.)</p><p></p><p>Variation in neck wall thickness at different points <em><u>of the same case</u></em> leads to poor concentricity, which can be measured as run-out.</p><p></p><p>I strongly suspect that true long range precision shooters (hopefully a few will weigh in shortly) will size the neck from the inside, not the outside.</p><p></p><p>Also, I trim to a uniform case length below maximum in an attempt to maintain uniform neck tension for the bullet. The importance of keeping case length below maximum is that if you exceed maximum, chambering a round can put a severe crimp at the case mouth with a potentially dangerous pressure spike to say nothing of what it can do to muzzle velocity and accuracy.</p><p></p><p>Using the Lee Collet dies I've been able to keep sub 3/4 MOA in my Remington 700 .30-06, which is fine for hunting but won't win even club matches against the benchrest crowd, let alone any competitions.</p><p></p><p>BTW, where are you located?</p></blockquote><p></p>
[QUOTE="Howland, post: 1373387, member: 103509"] Glad to see you here, Steve! Good to have you aboard. I want to add a couple disclaimers to my reply in our conversation. If you use Lee Collet dies, you are resizing the outside of the neck. Variation in neck wall thickness leads to variation in case neck tension, which leads to variation in muzzle velocity. Suboptimal. (I added that for the engineer that will always be within you.) Variation in neck wall thickness at different points [I][U]of the same case[/U][/I] leads to poor concentricity, which can be measured as run-out. I strongly suspect that true long range precision shooters (hopefully a few will weigh in shortly) will size the neck from the inside, not the outside. Also, I trim to a uniform case length below maximum in an attempt to maintain uniform neck tension for the bullet. The importance of keeping case length below maximum is that if you exceed maximum, chambering a round can put a severe crimp at the case mouth with a potentially dangerous pressure spike to say nothing of what it can do to muzzle velocity and accuracy. Using the Lee Collet dies I've been able to keep sub 3/4 MOA in my Remington 700 .30-06, which is fine for hunting but won't win even club matches against the benchrest crowd, let alone any competitions. BTW, where are you located? [/QUOTE]
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