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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="Bart B" data-source="post: 619771" data-attributes="member: 5302"><p>My case necks are pushed against the shoulder before the primer strikes. The cases have between 26 and 30 pounds of force holding them there after the primer strikes. That impact force even sets the case shoulder back a thousandth or more before the primer fires. I doubt case shoulders will bounce off the chamber shoulder; they stay there while the round fires. And bullet straightness isn't an issue. the case neck's well centered in the chamber neck when the primer detonates; even with 4 thousandths clearance all the way around the neck.</p><p></p><p>If one reduces loads 1 grain at a time on rimless bottleneck cases, when the charge is down by about 10 percent or so, the primer will start protruding out of its pocket. It does that 'cause the case shoulder's pressed hard against the chamber shoulder and the case body behind the shoulder's hard pressed against the chamber wall at that point. Meanwhile, the back of the case is stretching back and pushing the primer out until it stops against the bolt face. Only when there's enough peak pressure to do so will the primer get pushed back into its pocket as the case head gets pressed against the bolt face. Weaker loads won't push the back of the case all the way back so the head stops against the bolt face; the primer in that fired case sticks out a bit.</p><p></p><p>But you're sure making me think about all this stuff I experimented with. I don't think I've forgot any of it.</p></blockquote><p></p>
[QUOTE="Bart B, post: 619771, member: 5302"] My case necks are pushed against the shoulder before the primer strikes. The cases have between 26 and 30 pounds of force holding them there after the primer strikes. That impact force even sets the case shoulder back a thousandth or more before the primer fires. I doubt case shoulders will bounce off the chamber shoulder; they stay there while the round fires. And bullet straightness isn't an issue. the case neck's well centered in the chamber neck when the primer detonates; even with 4 thousandths clearance all the way around the neck. If one reduces loads 1 grain at a time on rimless bottleneck cases, when the charge is down by about 10 percent or so, the primer will start protruding out of its pocket. It does that 'cause the case shoulder's pressed hard against the chamber shoulder and the case body behind the shoulder's hard pressed against the chamber wall at that point. Meanwhile, the back of the case is stretching back and pushing the primer out until it stops against the bolt face. Only when there's enough peak pressure to do so will the primer get pushed back into its pocket as the case head gets pressed against the bolt face. Weaker loads won't push the back of the case all the way back so the head stops against the bolt face; the primer in that fired case sticks out a bit. But you're sure making me think about all this stuff I experimented with. I don't think I've forgot any of it. [/QUOTE]
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