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Rifles, Reloading, Optics, Equipment
Reloading
Stoneypoint Headspace gauge
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<blockquote data-quote="Bart B" data-source="post: 106902" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>With fired Lee Collet neck sized brass it shoots in the .2s". With new brass it shoots ¾ to 1" with the exact same load.</p><p></p><p>[/ QUOTE ]I think I've an answer as to why those new cases didn't shoot so well. Sorry I forget to post it earlier.</p><p></p><p>New cases with their heads quite a bit out of square will not shoot too accurate. Even with a two lug bolt face that's been squared with the chamber axis. When the high point of the case slams against the bolt face, that sets up barrel movements that cause bad shots. </p><p></p><p>The good thing that happens is they're fairly squared up after the first firing. The hotter their first load was, the more squared up they'll be against a squared up bolt face. Which means they'll shoot more accurately when they're reloaded regardless of what sizing technique is used.</p><p></p><p>One can easily check case head squareness by setting a case on a hard, flat surface against a V-block, then spinning the case about its axis keeping the head squarely on the surface. If the head's out of square, the case will rotate in a circle. The mouth will appear to nutate or go through a coning motion. Of course, if the case neck's bent out of alignment with the case body, that will change things a bit.</p><p></p><p>What's interesting is to shoot a new case with its head way out of square, then reload and shoot it several times checking it for head squareness each time. They do square up a little bit at a time.</p></blockquote><p></p>
[QUOTE="Bart B, post: 106902, member: 5302"] [ QUOTE ] With fired Lee Collet neck sized brass it shoots in the .2s”. With new brass it shoots ¾ to 1” with the exact same load. [/ QUOTE ]I think I've an answer as to why those new cases didn't shoot so well. Sorry I forget to post it earlier. New cases with their heads quite a bit out of square will not shoot too accurate. Even with a two lug bolt face that's been squared with the chamber axis. When the high point of the case slams against the bolt face, that sets up barrel movements that cause bad shots. The good thing that happens is they're fairly squared up after the first firing. The hotter their first load was, the more squared up they'll be against a squared up bolt face. Which means they'll shoot more accurately when they're reloaded regardless of what sizing technique is used. One can easily check case head squareness by setting a case on a hard, flat surface against a V-block, then spinning the case about its axis keeping the head squarely on the surface. If the head's out of square, the case will rotate in a circle. The mouth will appear to nutate or go through a coning motion. Of course, if the case neck's bent out of alignment with the case body, that will change things a bit. What's interesting is to shoot a new case with its head way out of square, then reload and shoot it several times checking it for head squareness each time. They do square up a little bit at a time. [/QUOTE]
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Reloading
Stoneypoint Headspace gauge
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