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<blockquote data-quote="Mikecr" data-source="post: 2698121" data-attributes="member: 1521"><p>I know what you mean, but you have your terms messed up.</p><p>Ogive, or ogive length, or entire length of a bullet nose, does not change. It's bullet build, independent of a barrel.</p><p>Cartridge Base To Ogive (CBTO) is set by cartridge build, and is independent of a barrel. Same with COAL.</p><p></p><p>Your seated distance to lands, land relationship, is a different attribute that really never matters to me.</p><p>The only thing I check in this regard is Max CBTO with a brand new barrel, just for a baseline of seating testing.</p><p>I don't really care what that comes out to, and it's rare that I ever check to see how much it changed later.</p><p></p><p>What matters is doing actual full seating testing (like Berger recommended) to find best CBTO, to go into powder development with.</p><p>While off the lands, it doesn't matter where best CBTO puts land relationship (which will constantly change), as best CBTO doesn't change.</p><p>It will hold for the accurate life of a barrel -for that bullet.</p><p></p><p>Your lands may erode 5-6" down the barrel as you go, but it doesn't matter. the gun may still shoot just fine.</p><p>Throat erosion is not what ends accurate barrel life.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2698121, member: 1521"] I know what you mean, but you have your terms messed up. Ogive, or ogive length, or entire length of a bullet nose, does not change. It's bullet build, independent of a barrel. Cartridge Base To Ogive (CBTO) is set by cartridge build, and is independent of a barrel. Same with COAL. Your seated distance to lands, land relationship, is a different attribute that really never matters to me. The only thing I check in this regard is Max CBTO with a brand new barrel, just for a baseline of seating testing. I don't really care what that comes out to, and it's rare that I ever check to see how much it changed later. What matters is doing actual full seating testing (like Berger recommended) to find best CBTO, to go into powder development with. While off the lands, it doesn't matter where best CBTO puts land relationship (which will constantly change), as best CBTO doesn't change. It will hold for the accurate life of a barrel -for that bullet. Your lands may erode 5-6" down the barrel as you go, but it doesn't matter. the gun may still shoot just fine. Throat erosion is not what ends accurate barrel life. [/QUOTE]
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