Cartridge measurements

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Gunngee_.300

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Ok, this may seem like a stupid question but here it goes. When you have a measurement for a cartridge for example 7.62X39(SKS) or 6.5X55. Where does the 39/55 measure from? is it the full length of the cartridge bullet included or is it the cartridge without the bullet??? Just something that's always puzzled me. I know what 7.62/6.5mm is. Kinda self explanatory.
 
7.62mm is the bullet diameter(approx.) and 39mm is the casing length

Same with the 6.5mmx55mm...

As for other cartridges, like the 30/30 and 45/70, these are older names. 30 calibre with 30 grains of blackpowder behind it...45 calibre with 70 grains of blackpowder behind it.

.30/06 sprg however is a 30 cal projectile made in 1906...metric designation is 7.62mmX63mm
 
peckerwood, Said it right, there isn't a really "standard"... Another example of "how they got a name for it...", would be shotguns...

12 gauge = 12 lead balls the diameter of the bore weighing one pound
20 gauge = 20 bla bla bla
etc...

Cheers
Jay
 
.410 shotgun is the caliber - .410".

Then there is 17/222, which is nothing more than a .222 necked down to .17. Also 44-85 Wesson, which is .44 caliber back by 85gr of blackpowder.

Confused yet?

Welcome to the world of reloading.

RePete.
 
I understand that 7.62mm is .308 caliber and that it's the diameter of the bullet. Is the length the measurement of the entire cartridge with the bullet? or is it just the casing?
 
"...stay away from wildcats if you wish to keep your sanity..." That won't help much. The nomenclature cartridges in general can make you crazy.
"...Is the length the measurement of the..." Just the case in mm's. It's a European thing.
 
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