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Rifles, Reloading, Optics, Equipment
Reloading
Best approach for consistent bullet release
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<blockquote data-quote="Bart B" data-source="post: 684492" data-attributes="member: 5302"><p>First off, virtualy all graphite is an abrasive. If you want that going into your barrel, use it someplace in the case so it'll go down the bore when the round's fired.</p><p></p><p>Second, the most consistant bullet release force is attained when the case necks hold them with the least amount of pressure. A 20% spread in release force is normal, so get it down to a few ounces for the best consistancy. Which means you've got to get your fired case necks sized such that their mouth's about .0001" smaller than bullet diameter. With very light release force on bullets, one's gotta handle that ammo gently else a bump will relocate the bullet in the case neck.</p><p></p><p>Third, to further make the resistance to the bullet starting to move the same for each shot, seat bullets out far enough so they're set back several thousandths when chamberd. At least .010" longer than what OAL is when a bullet's seated in a sized case by chambering it. That'll compensate for the case headspace (case head to shoulder reference) spread on bottleneck cases headspacing on their shoulder 'cause they all vary a bit.</p><p></p><p>Fourth, I don't think bore brushing out powder fouling in fired case neck is a bad idea. Having not ever seen any bad things happen, it's OK by me. After all, brand new cases holding brand new bullets in good 30 year old commercial match ammo's never been a problem with their squeaky clean surfaces together (Western Cartridge Co.'s WCC60 made in 1960, .308 Win. 190-gr. stuff shot in 1990). So making fired cases like brand new ones shouldn't matter either. But as always, some folks come up with reasons to do otherwise.</p></blockquote><p></p>
[QUOTE="Bart B, post: 684492, member: 5302"] First off, virtualy all graphite is an abrasive. If you want that going into your barrel, use it someplace in the case so it'll go down the bore when the round's fired. Second, the most consistant bullet release force is attained when the case necks hold them with the least amount of pressure. A 20% spread in release force is normal, so get it down to a few ounces for the best consistancy. Which means you've got to get your fired case necks sized such that their mouth's about .0001" smaller than bullet diameter. With very light release force on bullets, one's gotta handle that ammo gently else a bump will relocate the bullet in the case neck. Third, to further make the resistance to the bullet starting to move the same for each shot, seat bullets out far enough so they're set back several thousandths when chamberd. At least .010" longer than what OAL is when a bullet's seated in a sized case by chambering it. That'll compensate for the case headspace (case head to shoulder reference) spread on bottleneck cases headspacing on their shoulder 'cause they all vary a bit. Fourth, I don't think bore brushing out powder fouling in fired case neck is a bad idea. Having not ever seen any bad things happen, it's OK by me. After all, brand new cases holding brand new bullets in good 30 year old commercial match ammo's never been a problem with their squeaky clean surfaces together (Western Cartridge Co.'s WCC60 made in 1960, .308 Win. 190-gr. stuff shot in 1990). So making fired cases like brand new ones shouldn't matter either. But as always, some folks come up with reasons to do otherwise. [/QUOTE]
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Best approach for consistent bullet release
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