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Rifles, Reloading, Optics, Equipment
Reloading
Bullet ogive differences
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<blockquote data-quote="Mikecr" data-source="post: 1208653" data-attributes="member: 1521"><p>Depends on the bullet comparator tool you're referring to. There are quite a few.</p><p></p><p> If you're measuring 'base to ogive' only, then you have no idea what you're measuring specifically(not really). If measuring CBTO with a comparator keep in mind that is a local measure which follows no standard otherwise. It is important in that you define your best seating with it, and it's good as long as the condition is maintained with THAT specific tool, and THAT lot of bullets. Otherwise, start over.</p><p></p><p> That's hypothetical and not ever reality. So no, I'm not telling you that.</p><p>Normal variance in bearing means nothing to pressure beyond initial engraving force, for realistic ~10thou variance of soft copper. About what it takes to engrave a +/- fold of tin foil..</p><p>I've tested it to my satisfaction,, you're welcome to show where someone has tested and found other results. It would take a better chrono than mine(possibly LabRadar), and a fast powder underbore(like a 6PPC). However, most underbore shooters are not using long bearing bullets.</p><p>Good luck finding any more than blind assumptions with this.</p><p></p><p>If you've set your seated CBTO 10thou off the lands(OTL), and nothing about bearing in itself will change CBTO by 10thou, then bullet variance is NOT causing pressure issues.. Normal bullet variances are not enough to cause it.</p><p>Hell, it's likely fewer than 1% of reloaders think about this, and fewer than 1% of those worry about it, and fewer than 1% of those worry so much as to actually run a basic test.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1208653, member: 1521"] Depends on the bullet comparator tool you're referring to. There are quite a few. If you're measuring 'base to ogive' only, then you have no idea what you're measuring specifically(not really). If measuring CBTO with a comparator keep in mind that is a local measure which follows no standard otherwise. It is important in that you define your best seating with it, and it's good as long as the condition is maintained with THAT specific tool, and THAT lot of bullets. Otherwise, start over. That's hypothetical and not ever reality. So no, I'm not telling you that. Normal variance in bearing means nothing to pressure beyond initial engraving force, for realistic ~10thou variance of soft copper. About what it takes to engrave a +/- fold of tin foil.. I've tested it to my satisfaction,, you're welcome to show where someone has tested and found other results. It would take a better chrono than mine(possibly LabRadar), and a fast powder underbore(like a 6PPC). However, most underbore shooters are not using long bearing bullets. Good luck finding any more than blind assumptions with this. If you've set your seated CBTO 10thou off the lands(OTL), and nothing about bearing in itself will change CBTO by 10thou, then bullet variance is NOT causing pressure issues.. Normal bullet variances are not enough to cause it. Hell, it's likely fewer than 1% of reloaders think about this, and fewer than 1% of those worry about it, and fewer than 1% of those worry so much as to actually run a basic test. [/QUOTE]
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Bullet ogive differences
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