Why is it CBTO and not CHTO?

Swamplord

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Found the Troll !
hahaha !

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59FLH

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When you stand a cartridge on the flat part so the pointy part is pointing up, you've placed it on its head, correct?

Kindasorta. Your more right then wrong. Even their definitions are contradictory. According to SAAMI (The word of God) it's "The Face Of The Head"

HEAD​

The end of the cartridge case in which the primer or priming is inserted and the surface upon which the headstamp identification is imprinted.

CARTRIDGE CASE LENGTH​

The dimensions from face of the head to the mouth.

Also Known As: Case Length



Just say'n :)
 

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George Dean

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When you stand a cartridge on the flat part so the pointy part is pointing up, you've placed it on its head, correct? Where the head stamp is, right? So why is the measurement from the flat part to the point where the bullet starts to narrow towards the tip called the Cartridge Base To Ogive (CBTO) instead of the Cartridge Head To Ogive (CHTO)?

Just a newbie with too much time on his hands and a penchant for weird quirks of terminology wondering how the acronym came to be.
Do you stand a vase on its head or its base? Nomenclature is extremely important for accurate communication. If you'd been the first cartridge inventor you'd have been privileged to dub that part the base. ;-)
 

Pro2A

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You can’t have a head on one end, and neck and shoulder on the other end, with a body in the middle. 🤔 but... that’s what we got. Who cares though as long as we understand the meaning.
And, the head dimension is from the tip of the seated bullet (meplat??) to the end of the case mouth.
 

J-B welder

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And, the head dimension is from the tip of the seated bullet (meplat??) to the end of the case mouth.
OK, I think I was keeping up with the program until now, but that just doesn't make any sense at all, since neither end of the measured distance is anywhere near the head of the case.

But, as previously and repeatedly stated, that's what it's called so that's what it's called.
 

CBH Australia

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OK, I think I was keeping up with the program until now, but that just doesn't make any sense at all, since neither end of the measured distance is anywhere near the head of the case.

But, as previously and repeatedly stated, that's what it's called so that's what it's called.
Yep,
Measurements are taken from the flat bit to the other bit.
So COAL Case Overall Length from the base to the tip of the very end for overall length.

Now I forgot what the base to ogive is but the comparator gauge still goes from the flat bit to the point of measurement.This time being the ogive.
2 reasons
To seat at a given point in relation to the lands.
And because it's an accurate and repeatable point for consistency.
 

FEENIX

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OK, I think I was keeping up with the program until now, but that just doesn't make any sense at all, since neither end of the measured distance is anywhere near the head of the case.

But, as previously and repeatedly stated, that's what it's called so that's what it's called.
Like I previously noted, it does not matter what it is called as long as you know how to take the necessary measurements, i.e., seating depth, distance to the lands, etc ...

There is no need to complicate it unnecessarily.

 

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