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Rifles, Reloading, Optics, Equipment
Reloading
7mm Magnum Sizing
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<blockquote data-quote="Bart B" data-source="post: 814202" data-attributes="member: 5302"><p>When belted mag's were the norm for long range shoulder fired prone matches, the best scores were shot with new cases or fired ones full length sized all the way to the belt and setting the shoulder back a couple thousandths. Folks used to cut the body part out of a standard FL die then square its bottom to size the ridge in front of the belt back down all the way to the belt so it didn't interfere with the case shoulder slamming cleanly into the chamber shoulder perfectly centering the round when it fired. Such a die's called a "body" die for belted cases. </p><p></p><p>Belted cases sized to headspace on their shoulders will center the case neck and therefore the bullet best in the chamber anyway. The firing pin drives the case forward hard into the chamber shoulder and that's what best centers the front of the case in the chamber.</p><p></p><p>Larry Willis now has a collet die that's a lot better than a "body" die. Cases so full length sized can get 15 to 20 reloads with max charges easily.</p><p></p><p>That aside, unless your and your hardware can shoot belted cases no worse than 1 MOA past 500 yards, that collet die may not make a difference. Just use a standard FL die and don't set fired case shoulders back too far. Seat bullets so they gently seat back a bit as they crunch into the rifling; that well centers even the crooked ones.</p></blockquote><p></p>
[QUOTE="Bart B, post: 814202, member: 5302"] When belted mag's were the norm for long range shoulder fired prone matches, the best scores were shot with new cases or fired ones full length sized all the way to the belt and setting the shoulder back a couple thousandths. Folks used to cut the body part out of a standard FL die then square its bottom to size the ridge in front of the belt back down all the way to the belt so it didn't interfere with the case shoulder slamming cleanly into the chamber shoulder perfectly centering the round when it fired. Such a die's called a "body" die for belted cases. Belted cases sized to headspace on their shoulders will center the case neck and therefore the bullet best in the chamber anyway. The firing pin drives the case forward hard into the chamber shoulder and that's what best centers the front of the case in the chamber. Larry Willis now has a collet die that's a lot better than a "body" die. Cases so full length sized can get 15 to 20 reloads with max charges easily. That aside, unless your and your hardware can shoot belted cases no worse than 1 MOA past 500 yards, that collet die may not make a difference. Just use a standard FL die and don't set fired case shoulders back too far. Seat bullets so they gently seat back a bit as they crunch into the rifling; that well centers even the crooked ones. [/QUOTE]
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7mm Magnum Sizing
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