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Posted: 1/12/2002 7:26:12 AM EST
Why are some rounds referred to by caliber and others by mm??? For example, .45cal and 9mm... I know that caliber refers to diameter, but what exactly is the mm designation refering to? Is it length? Length of what? Bullet, cartridge, both??? I just can't figure it out...grrrrr... and I don't consider myself an amatuer either! Thanks
Link Posted: 1/12/2002 7:57:44 AM EST
Both are diameter meas. .45 cal is inch meas. 9mm is metric meas. like a yard to a meter and so on.
Link Posted: 1/12/2002 7:59:11 AM EST
Link Posted: 1/12/2002 8:09:51 AM EST
I guess it's Europe vs. America, which is to say Metric system vs. Imperial sys.
Link Posted: 1/12/2002 8:20:17 AM EST
Both of your examples refer to diameter in different measuring systems. Nomenclature for cartridge designations is based on everything from physical measurements to ego. SRM
Link Posted: 1/12/2002 9:10:47 AM EST
Link Posted: 1/12/2002 9:20:55 AM EST
Link Posted: 1/12/2002 9:44:41 AM EST
It's even more wackeir than you think. The 7.62X39 has a bullet that's larger in diameter than the 7.62X51. Also a .303 Brit is larger than a .308.
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