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Rifles, Reloading, Optics, Equipment
Reloading
Measuring OAL in precision ammo...
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<blockquote data-quote="Bart B" data-source="post: 779220" data-attributes="member: 5302"><p>If one looks at their rimless bottleneck cases, the point on them that always is at the exact same place in the chamber when fired is the shoulder. It's driven hard into the chamber shoulder by the firing pin and the primer fires very shortly thereafter</p><p></p><p>As there's typically a few thousandths spread from shoulder back to case head, bullets seated relative to the case head will have a few thousandths spread in their seater contact point to the case shoulder. Bullet seating reference should be measured from case shoulder to the seater contact point on the bullet.</p><p></p><p>The best place on the bullet to contact the bullet seater is the diameter where it first touches the rifling. Other places on the bullet's ogive may vary a thousandth lengthwise from that point as all bullets made with a given set of forming dies will not all have the exact same shape; they vary a tiny bit because the metals in them are not perfectly dimensioned nor perfectly uniform in their metalurgy makup. A couple thousandths spread in the bullet's jump distance to the rifling has no significant effect anyway; that tiny spread in dimensions is not significant to accuracy.</p></blockquote><p></p>
[QUOTE="Bart B, post: 779220, member: 5302"] If one looks at their rimless bottleneck cases, the point on them that always is at the exact same place in the chamber when fired is the shoulder. It's driven hard into the chamber shoulder by the firing pin and the primer fires very shortly thereafter As there's typically a few thousandths spread from shoulder back to case head, bullets seated relative to the case head will have a few thousandths spread in their seater contact point to the case shoulder. Bullet seating reference should be measured from case shoulder to the seater contact point on the bullet. The best place on the bullet to contact the bullet seater is the diameter where it first touches the rifling. Other places on the bullet's ogive may vary a thousandth lengthwise from that point as all bullets made with a given set of forming dies will not all have the exact same shape; they vary a tiny bit because the metals in them are not perfectly dimensioned nor perfectly uniform in their metalurgy makup. A couple thousandths spread in the bullet's jump distance to the rifling has no significant effect anyway; that tiny spread in dimensions is not significant to accuracy. [/QUOTE]
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Measuring OAL in precision ammo...
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