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ORIGINAL: TYLER_ROOKIE_HUNTER
how do you figure out the caliber of a gun,because i bought a old milatary rifle and the guy i bought it off of said it was a 7mm but the cartridge is too big and on the barrel it doesnt say anthing about the caliber all it has is a number "4415"
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The "caliber" of a gun isusually the measurement of its' bore diameter expressed in inches of millimeters. The bore diameter is the sizeof the hole bored through the barrel BEFOREthe rifling grooves are cut. ("Land diameter"). For example, a ".30 caliber" has a bore diameter of .300".
However, sometimes a caliber is named for the total diameter of the hole after the grooves have been cut. For example, the ".308 Winchester". This is a cartridge named for the groove diameter, but it is a ".30 caliber", and shoots the exact same
bullets as a .30/'06 or a .300 Weatherby - the bullets for all these measure .308" in diameter.
Where confusionconfusion comes from isthe fact that, whether anyspecific cartridge can be used in a specific gun,depends not only on the diameterof the
bullet,
("bullet" means the projectile that is fired, NOT a complete cartridge!) but also on the dimensions of the specific cartridge
for which the gun is chambered. For example, there are quite a few DIFFERENT 7mm cartridges, all of which use bullets in the range of .284" to .288" in diameter, but which have very different cartridge cases. They are therefore NOT usable in the same guns even though the bullets themselves may be identical.
A good example of this is the 7mm Mauser, a relatively small cased round and the 7mmRemington Magnum. I have rifles in both calibers, andload ammo for both, often using the same bullets! But due to the big difference in their cartridgecase sizes, one uses a lot more powder (the 7mm Rem, Mag.), and can be loaded to give a much higher MV than the 7mm Mauser does with the identical projectile. And neither round can be used in a rifle chambered for the other one, even though both are "7mm's"!
IF the rifle you have is a 7mm military rifle, it is probably some kind of Mauser, and will most likely be chambered for the 7X57mm Mauser cartridge. The 7mm Remington Mag., or any otther 7mm Magnum round, will be way too big to fit that gun!
(Thee may be some, but I personally have NEVER seen a military rifle with a caliber designation on it. I guess most armies just assume the troops will use the correct ammo!)
HELP!!!
