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Effects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) – Part 2
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<blockquote data-quote="Mikecr" data-source="post: 1097589" data-attributes="member: 1521"><p>It's easier to understand CBTO where we focus on just that.</p><p>Relationship to the lands doesn't matter with CBTO, nor do base-to-ogive measurements.</p><p>The best shooting CBTO will reveal itself through testing, regardless of anything else.</p><p>And it doesn't matter where the bearing to ogive junction is, as ogive contact datum is set by bore diameter and leade angle(before bearing).</p><p></p><p>Maybe I missed it in the article but another factor(as though there aren't enough) is ogive radius variance of bullet noses(even from the same type/lot). A change in this radius shifts all datums.</p><p>We can separate bullets into matching radius through measure(real or relative), which then qualifies the rest of our contact/datums.</p><p>I recommend this before acting off nose contact, like with meplat trimming, or determining local CBTO, etc.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1097589, member: 1521"] It's easier to understand CBTO where we focus on just that. Relationship to the lands doesn't matter with CBTO, nor do base-to-ogive measurements. The best shooting CBTO will reveal itself through testing, regardless of anything else. And it doesn't matter where the bearing to ogive junction is, as ogive contact datum is set by bore diameter and leade angle(before bearing). Maybe I missed it in the article but another factor(as though there aren't enough) is ogive radius variance of bullet noses(even from the same type/lot). A change in this radius shifts all datums. We can separate bullets into matching radius through measure(real or relative), which then qualifies the rest of our contact/datums. I recommend this before acting off nose contact, like with meplat trimming, or determining local CBTO, etc. [/QUOTE]
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Effects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) – Part 2
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