Originally Posted by Max Heat
Hmm, I thought the 30 carbine (kalashnikov, or is it kalishnakov?) was 7.62x39, the .308 was 7.62x51, and the 30-06 was 7.62x57. But according to chuck hawk, the 30-06 is about 10 grains more than that. And the x57 round does appear to be the 7.21x57 (7mmx57) mouser case. Maybe THAT be the .284 case you refer to with the 22-284? I have decided to put this on the back burner and concentrate on getting some maximum barrel into my ultra 7 for now, anyways.
.30 carbine fits the US WW2 era m1 carbine. In some european settings it is referred to as 7.62x33. The 7.62x39 is a different, much more powerful cartridge.
The .308 and the 7.62x51 are very close and in most cases interchangeable.
The .30-06 is called 7.62x63 in the european technical way of designating cartridges, the x57 case you keep referring to is most likely the 8x57 Mauser (not mouser, it's a German name), which is actually sometimes referred to as the 7,92x57 mauser. That cartridge was used by the Germans in ww1 and ww2.
There is another Mauser cartridge using virtually the same case but with a 7 mm bullet that is called 7x57. It is absolutely not the same as the .284 winchester, although they do use the same diameter bullets.
There is no 100% consistent method for naming cartridges! Us europeans usually call the cartridges diameter of bullet x length of case.
There might be several different types of cartridge with the same caliber and the same length of case, so our system is not perfect either. The .284 Winchester is not as popular here in Sweden as the .284 winchester necked down to accept 6,5 mm bullets. This wildcat is usually called 6,5-.284 Norma. The police refers to it as the 6,5x55, which is extremely confusing as 6,5x55 is the name of our old military cartridge, which is not similar to the 6,5-.284 Norma at all!
I hope I've cleared out some fog.