CBTO the same with every bullet?

[NDSwede]

If the CBTO is a certain length such as 1.750 with one type of bullet ( Speer 120 gr gold dot for example), would it be the same for another bullet such as a Hornady 123 SST?
Could you explain your thinking regardless of your answer. Thanks

[Klem]

Swede,

Across brands and types, bullets of the same weight have different shapes. Because of this, when loaded to the same COAL (base-to-tip) they will likely have different CBTO's (base-to-ogive). CBTO is predicated on the ID of the gauge you use. Where that ID comes to rest on the bullet depends on the shape of the bullet.

[37L1]

The same bullet from a different lot can have a different CBTO. I've even seen a certain manufacturer (Hornady) have more than one different CBTO from the same box!

[stef1274]

No it wouldn't. Or it could, but that would be coincidental. It is one of the reasons for wanting to measure CBTO, because same COAL may not mean same distance to lands.

[Fess]

https://bulletin.accurateshooter.com/2014/10/ogive-no-jive-litz-explains-tangent-secant-and-hybrid-ogives/

[NDSwede]

Thanks everyone for responding. I understand it better. Each person added something to understanding it more.
I recently measured 100 6mm Speer 100 spbt bullets and the lengths to ogive varied 12 thousandths from shortest to longest.
Also measured some Hornady 103 ELD-X. They only varied 1 thousandth from shortest to longest.