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Rifles, Reloading, Optics, Equipment
Reloading
What is ogive?
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<blockquote data-quote="Mikecr" data-source="post: 1698448" data-attributes="member: 1521"><p>Other issues here are the common fallacies in purpose.</p><p>Bullet matching should boil down to BC, as there is rarely anything in build variance affecting internal ballistics. That is, an actual full blown flaw.</p><p></p><p>Base to ogive(Bullet BTO) includes base angle, end diameter, base length, bearing length, and bearing to ogive datum. All meaning relatively less to BC, and without considering each individually, you cannot determine an actual mismatch in BC.</p><p>If base angle causes smaller end diameter and longer base length while bearing is a tad longer and ogive radius is a bit lower, what happened to BC? Did all combining cause your BTO measure to read higher, lower, or same? </p><p></p><p>On meplats, the worse thing you can do is trim to make bullets the same OAL. This would leave big variance in meplat diameters, which is big to BC.</p><p>To get meplat diameters the same through trimming means trimming from a consistent ogive datum, and now you go back to qualifying ogive radius to get that. Right now, a Bob Green Comparator(BGC) is needed to do it.</p><p>And as hard as it seems to measure from a datum high on ogives, try measuring meplat diameters..</p><p></p><p>You're gonna need a $Keyence laser mic$ to do this stuff with speed & accuracy.</p><p>To match BC, you need software to calculate drag per attribute as fed from said laser mic, summed into overall BC (as calculated). With that you have information to credibly act on.</p><p>This should be done by QC at the bullet making source, and it might even be viable.</p><p>A bullet maker could actually match BC in lots, offering these premium lots, saving everybody else from engaging in the silly pooch poke that BTO measure represents.</p><p>It could be automated, bullets go in one chute and come out 10 chutes for ~$250K.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1698448, member: 1521"] Other issues here are the common fallacies in purpose. Bullet matching should boil down to BC, as there is rarely anything in build variance affecting internal ballistics. That is, an actual full blown flaw. Base to ogive(Bullet BTO) includes base angle, end diameter, base length, bearing length, and bearing to ogive datum. All meaning relatively less to BC, and without considering each individually, you cannot determine an actual mismatch in BC. If base angle causes smaller end diameter and longer base length while bearing is a tad longer and ogive radius is a bit lower, what happened to BC? Did all combining cause your BTO measure to read higher, lower, or same? On meplats, the worse thing you can do is trim to make bullets the same OAL. This would leave big variance in meplat diameters, which is big to BC. To get meplat diameters the same through trimming means trimming from a consistent ogive datum, and now you go back to qualifying ogive radius to get that. Right now, a Bob Green Comparator(BGC) is needed to do it. And as hard as it seems to measure from a datum high on ogives, try measuring meplat diameters.. You're gonna need a $Keyence laser mic$ to do this stuff with speed & accuracy. To match BC, you need software to calculate drag per attribute as fed from said laser mic, summed into overall BC (as calculated). With that you have information to credibly act on. This should be done by QC at the bullet making source, and it might even be viable. A bullet maker could actually match BC in lots, offering these premium lots, saving everybody else from engaging in the silly pooch poke that BTO measure represents. It could be automated, bullets go in one chute and come out 10 chutes for ~$250K. [/QUOTE]
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What is ogive?
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