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Rifles, Reloading, Optics, Equipment
Reloading
Measuring OAL in precision ammo...
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<blockquote data-quote="Mikecr" data-source="post: 779456" data-attributes="member: 1521"><p>One datum to another on a bullet nose provides for calculation of ogive radius, which affects BC, or what a meplat diameter would end up after trimming, which again affects BC. And yes, it affects pretty much all bullet portion length measurements(invalidating what most think they measure).</p><p>But seating affects of ogive radius variance, as compared in measure, is well under 1thou. That's not to say actual seating depth changes so little, but that counteraction results in so little measured.</p><p></p><p>Actual seating depth variances(bearing seated) doesn't matter to accuracy. What matters is distance from ogive contact point to leade angle/distance. I've heard & read many explanations as to why, but nothing explaining why so much, or for some combinations, why so little.</p><p>With my last 3 load workups, the biggest gains were through seating adjustments.</p><p>My seating with Wilson dies measures <1thou variance, and this from Berger bullets mixed in lots(they aren't the same). I haven't seen where the bullet dimensions change seating consistency, provided seating forces are rational and consistent.</p><p></p><p>Some people set themselves backward by frequent annealing of necks. While it might(if actually done well) normalize seating forces, it also increases seating forces, which affects seating variances with ogive radius variances. </p><p>But I suspect these people never fully investigated best seating to begin, so they don't see this & they think it's normal to have a lot of variance in OgvOAL.</p><p>I know it don't have to be that way, normal or not.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 779456, member: 1521"] One datum to another on a bullet nose provides for calculation of ogive radius, which affects BC, or what a meplat diameter would end up after trimming, which again affects BC. And yes, it affects pretty much all bullet portion length measurements(invalidating what most think they measure). But seating affects of ogive radius variance, as compared in measure, is well under 1thou. That's not to say actual seating depth changes so little, but that counteraction results in so little measured. Actual seating depth variances(bearing seated) doesn't matter to accuracy. What matters is distance from ogive contact point to leade angle/distance. I've heard & read many explanations as to why, but nothing explaining why so much, or for some combinations, why so little. With my last 3 load workups, the biggest gains were through seating adjustments. My seating with Wilson dies measures <1thou variance, and this from Berger bullets mixed in lots(they aren't the same). I haven't seen where the bullet dimensions change seating consistency, provided seating forces are rational and consistent. Some people set themselves backward by frequent annealing of necks. While it might(if actually done well) normalize seating forces, it also increases seating forces, which affects seating variances with ogive radius variances. But I suspect these people never fully investigated best seating to begin, so they don't see this & they think it's normal to have a lot of variance in OgvOAL. I know it don't have to be that way, normal or not. [/QUOTE]
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Measuring OAL in precision ammo...
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