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Rifles, Reloading, Optics, Equipment
Reloading
Cbto
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<blockquote data-quote="MagnumManiac" data-source="post: 986738" data-attributes="member: 10755"><p>The reason is because you are NOT measuring a datum on the comparator, but the point at which the ogive is touching the rifling, ogives are different lengths and shapes, there are basically 2 common types used. Secant and Tangent. Then there's hybrids based upon these, which I won't go into.</p><p>ie, a partition in bigger cals has a semi spitzer shape, or less pointy, it will contact the rifling sooner than a true spitzer like an Accubond, even if the same weight.</p><p>Hope this helps you understand the differences between bullet shapes, and why it is important to actually measure with each type of bullet where it touches the rifling, it isn't uncommon for 2 weights in the same calibre to have the same ogive length, but you won't know, unless you measure it.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 986738, member: 10755"] The reason is because you are NOT measuring a datum on the comparator, but the point at which the ogive is touching the rifling, ogives are different lengths and shapes, there are basically 2 common types used. Secant and Tangent. Then there's hybrids based upon these, which I won't go into. ie, a partition in bigger cals has a semi spitzer shape, or less pointy, it will contact the rifling sooner than a true spitzer like an Accubond, even if the same weight. Hope this helps you understand the differences between bullet shapes, and why it is important to actually measure with each type of bullet where it touches the rifling, it isn't uncommon for 2 weights in the same calibre to have the same ogive length, but you won't know, unless you measure it. Cheers. gun) [/QUOTE]
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