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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
School me on "the doughnut "
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<blockquote data-quote="BountyHunter" data-source="post: 1250798" data-attributes="member: 12"><p>Brass will flow from outside to inside. Sorry but is true.</p><p></p><p>Seldom talked about technique for shooting flat base bullets is to turn the top of the necks for about .050 down and a few thousands thinner. Fire them once and that thinner part will move to the inside of the neck. That makes it easier to seat FBI bullets without skewing or damaging case mouth.</p><p></p><p>Donut on inside can also come from not sizing the neck all the way down and that allows a brass flow. Yes it can be easily measured with pin guages and is by more knowledgeable reladers. That happens when the bullet bearing surface is above that portion of the neck and you never feel it when seating the same bullet. Change to a bullet that is seated deeper and you will feel it. That is also why top accuracy BRAD showers us Arbor presses with gauges to measure seating force.</p></blockquote><p></p>
[QUOTE="BountyHunter, post: 1250798, member: 12"] Brass will flow from outside to inside. Sorry but is true. Seldom talked about technique for shooting flat base bullets is to turn the top of the necks for about .050 down and a few thousands thinner. Fire them once and that thinner part will move to the inside of the neck. That makes it easier to seat FBI bullets without skewing or damaging case mouth. Donut on inside can also come from not sizing the neck all the way down and that allows a brass flow. Yes it can be easily measured with pin guages and is by more knowledgeable reladers. That happens when the bullet bearing surface is above that portion of the neck and you never feel it when seating the same bullet. Change to a bullet that is seated deeper and you will feel it. That is also why top accuracy BRAD showers us Arbor presses with gauges to measure seating force. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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School me on "the doughnut "
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