Bullets

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Using the 7.62x39 cartridge as an example.
7.62mm = Bullet diameter or Bore size.
39mm = Cartridge case length.

The "bullet" is the part of the cartridge that flies out of the barrel when you shoot the cartridge or round.
In other words, a "bullet" is only the projectile part of the complete cartridge.

But cartridge naming over the last 150 years is fraught with confusion.

For instance the old 45-70 Government cartridge means a .45 caliber bullet with 70 grains of black powder was the original load.

A 7mm-08 means a .308 Win case necked down to shoot a 7mm bullet.

A 22-250 Remington means a 250/3000 Savage case necked down to shoot a 224" bullet.

And the 250/3000 Savage name meant a 25 caliber bullet going 3,000 feet per second.

And it gets worse the more you get into cartridge names.

rc
 
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rcmodel speaketh the truth.

A small detail is that the numbers aren't always scientifically accurate, but they are close. E.g. 270 Winchester bullets do not measure 0.270"
 
I was just trying to help the OP understand cartridge naming.

Is there a problem or what?

rc
 
Rc, I know you were. Don't get your panties in a knot dude. I was just pullin your chain a little bit. :banghead:
Perhaps you should check with your doctor and see if your medication is strong enough :evil:
 
unfortunately sometimes when it is bore diameter they measure between the lands, and sometimes the grooves, and sometimes who the heck knows....

Like the 7.62x39 and 7.62x54R both use a larger bullet than the 7.62x51 NATO.
The 7.62x39 and 7.62x54R use a .311 or .312 bullet which is 7.91mm or 7.92mm...the 7.62x51 NATO uses a .308 bullet or 7.82mm. The .303 British uses the same size bullet as the 7.62x39 and 7.62x54R....as does the 7.7mm Arisaka.

The 7.92x57 (8mm Mauser) uses an 8.2mm or .323 bullet.
 
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