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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bump FL sizing and measurements
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<blockquote data-quote="MNbogboy" data-source="post: 1785763" data-attributes="member: 18849"><p>In order to "bump" the shoulder in a FL die the shoulder of the case has to reach the corresponding shoulder in the die. That means you will be sizing all of the neck just as in regular FL sizing. The case normally always gets longer as you "squeeze" it in a die. Only once the shoulder is reached does it the base to shoulder measurement start dropping but overall length continues to increase.</p><p>Keep turning the die down a small amount at a time to eventually start "bumping" the shoulder. Take measurements as you go until you achieve .002 (or whatever number you are shooting for). Using a different piece of fired brass for each dimension check may get you to goal sooner because once you start bumping springback changes with each successive try. </p><p>Mark the shoulder of your trial pieces with a "sharpie" you will see it start rubbing off as it first meets the die shoulder.</p><p>Note: fresh annealer brass bumps easier and farther so it is best to check often with your case comparator. (I measure every piece of brass and adjust accordingly).</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1785763, member: 18849"] In order to "bump" the shoulder in a FL die the shoulder of the case has to reach the corresponding shoulder in the die. That means you will be sizing all of the neck just as in regular FL sizing. The case normally always gets longer as you "squeeze" it in a die. Only once the shoulder is reached does it the base to shoulder measurement start dropping but overall length continues to increase. Keep turning the die down a small amount at a time to eventually start "bumping" the shoulder. Take measurements as you go until you achieve .002 (or whatever number you are shooting for). Using a different piece of fired brass for each dimension check may get you to goal sooner because once you start bumping springback changes with each successive try. Mark the shoulder of your trial pieces with a "sharpie" you will see it start rubbing off as it first meets the die shoulder. Note: fresh annealer brass bumps easier and farther so it is best to check often with your case comparator. (I measure every piece of brass and adjust accordingly). [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bump FL sizing and measurements
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