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Rifles, Reloading, Optics, Equipment
Reloading
Base to ogive help pls
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<blockquote data-quote="FearNoWind" data-source="post: 1083051" data-attributes="member: 50867"><p>I think we'd better clarify some terms before we get too deeply engaged in this conversation.</p><p>CBTO is the distance from the base of the cartridge case to the ogive of the bullet. The distance to the tip of the bullet is not a factor in that data collection process.</p><p></p><p>Bullet base to ogive has no effect on either of those measurements.</p><p></p><p>The instrument you have is quite valuable for sorting bullets by "<u>bullet</u> base to ogive" lengths. But it won't provide you with CBTO information unless you can move that bushing out far enough to get a cartridge case with a seated bullet between the dial indicator and the bushing. Even then, unless you can ensure that the bullet doesn't move inside the neck while setting up the measurement you can't be certain of the validity of the data.</p><p></p><p>To gather CBOL data you need something like:</p><p><strong><a href="http://www.midwayusa.com/product/761522/hornady-lock-n-load-overall-length-gage-modified-case-30-06-springfield" target="_blank">http://www.midwayusa.com/product/761522/hornady-lock-n-load-overall-length-gage-modified-case-30-06-springfield</a></strong></p><p>and</p><p><strong><a href="http://www.midwayusa.com/product/570611/hornady-lock-n-load-overall-length-gage-bolt-action?cm_vc=ProductFinding" target="_blank">http://www.midwayusa.com/product/570611/hornady-lock-n-load-overall-length-gage-bolt-action?cm_vc=ProductFinding</a></strong></p><p> and</p><p><strong><a href="http://www.midwayusa.com/product/231904/hornady-lock-n-load-bullet-comparator-basic-set-with-6-inserts" target="_blank">http://www.midwayusa.com/product/231904/hornady-lock-n-load-bullet-comparator-basic-set-with-6-inserts</a></strong></p><p>along with a good caliper.</p><p></p><p>Once you get to that point, don't expect the CBTO of the loaded rounds you have to compare with those that you intend to load UNLESS the bullets are the same caliber/style/weight/manufacturer. Bullets differ (even bullets of the same caliber from the same manufacturer from lot to lot) so avoid complacency when you're collecting comparative data.</p></blockquote><p></p>
[QUOTE="FearNoWind, post: 1083051, member: 50867"] I think we'd better clarify some terms before we get too deeply engaged in this conversation. CBTO is the distance from the base of the cartridge case to the ogive of the bullet. The distance to the tip of the bullet is not a factor in that data collection process. Bullet base to ogive has no effect on either of those measurements. The instrument you have is quite valuable for sorting bullets by "[U]bullet[/U] base to ogive" lengths. But it won't provide you with CBTO information unless you can move that bushing out far enough to get a cartridge case with a seated bullet between the dial indicator and the bushing. Even then, unless you can ensure that the bullet doesn't move inside the neck while setting up the measurement you can't be certain of the validity of the data. To gather CBOL data you need something like: [B][URL]http://www.midwayusa.com/product/761522/hornady-lock-n-load-overall-length-gage-modified-case-30-06-springfield[/URL][/B] and [B][URL]http://www.midwayusa.com/product/570611/hornady-lock-n-load-overall-length-gage-bolt-action?cm_vc=ProductFinding[/URL][/B] and [B][URL]http://www.midwayusa.com/product/231904/hornady-lock-n-load-bullet-comparator-basic-set-with-6-inserts[/URL][/B] along with a good caliper. Once you get to that point, don't expect the CBTO of the loaded rounds you have to compare with those that you intend to load UNLESS the bullets are the same caliber/style/weight/manufacturer. Bullets differ (even bullets of the same caliber from the same manufacturer from lot to lot) so avoid complacency when you're collecting comparative data. [/QUOTE]
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Base to ogive help pls
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