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Rifles, Reloading, Optics, Equipment
Reloading
Cbto
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<blockquote data-quote="live2huntmt" data-source="post: 986719" data-attributes="member: 75903"><p>I feel really dumb because I have to be missing something very basic here...so can someone please explain this to me in simple terms:</p><p> </p><p>While using a hornady bullet comparator to measure maximum "Cartridge Base To Ogive" or CBTO .... why does it vary with different style bullets?</p><p> </p><p>Shouldn't the measurement from wherever the bullet touches the lands, to the back of the cartridge....be the same for all bullets? I understand the fact that the Cartridge Over All Length or COAL should change because the "nose" of different style bullets is longer/shorter. But the datum line that the comparator touches the bullet at...to the cartridge base seems like it should always be the same.</p><p> </p><p>The only thing I can come up with is that the diameter of the 30 caliber Hornady comparator is not the same diameter of my barrel lands.....therefore the datum line of the comparator is not the datum line of the lands.</p><p> </p><p>Any help is greatly appreciated! Thanks</p></blockquote><p></p>
[QUOTE="live2huntmt, post: 986719, member: 75903"] I feel really dumb because I have to be missing something very basic here...so can someone please explain this to me in simple terms: While using a hornady bullet comparator to measure maximum "Cartridge Base To Ogive" or CBTO .... why does it vary with different style bullets? Shouldn't the measurement from wherever the bullet touches the lands, to the back of the cartridge....be the same for all bullets? I understand the fact that the Cartridge Over All Length or COAL should change because the "nose" of different style bullets is longer/shorter. But the datum line that the comparator touches the bullet at...to the cartridge base seems like it should always be the same. The only thing I can come up with is that the diameter of the 30 caliber Hornady comparator is not the same diameter of my barrel lands.....therefore the datum line of the comparator is not the datum line of the lands. Any help is greatly appreciated! Thanks [/QUOTE]
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