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03-10-2013, 01:50 AM
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#1
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. Vs mm
Why are some ammo types written with a decimal ex: .22 .38 .45 and others with millimeters ex: 7mm 9mm 10mm
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03-10-2013, 03:02 AM
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#2
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because in europe they are not smart enough to figure out real measurements so they have to use idiot proof mm.
Really it is mostly American cartridges are all in inche measurements and forigen cartridges are in metric. It really depends on the devloper and or the marketing department.
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03-10-2013, 03:29 AM
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#3
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Moderator
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The creator of a cartridge gets to name it. Those created in Europe were typically named using the metric system. America and Britain, fractions of an inch (.22 is 22/100ths, etc) You will also find OLD names, such as 45-70 that designated caliber of bullet in inch fractions, and the weight of black powder.
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What we have heah is.... failure to communicate.
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03-10-2013, 03:38 AM
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#4
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Game on...
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Quote:
Originally Posted by c3shooter
The creator of a cartridge gets to name it. Those created in Europe were typically named using the metric system. America and Britain, fractions of an inch (.22 is 22/100ths, etc) You will also find OLD names, such as 45-70 that designated caliber of bullet in inch fractions, and the weight of black powder.
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Thus endith the lesson... 
BTW there are 2.54 cm per inch and 25.4 mm per inch, just in case anyone wants to compare .XX" to XX mm. For example a .50 BMG would be approx 13 mm (.5 x 25.4mm). 
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"The whole of the Bill (of Rights) is a declaration of the right of the people at large or considered as individuals.... It establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." (Albert Gallatin of the New York Historical Society, October 7, 1789)
"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington
Last edited by Jpyle; 03-10-2013 at 03:42 AM.
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03-10-2013, 03:39 AM
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#5
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This could be a huge topic. Many make sense, many don't. A quick example is a .38 is really .357....
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03-10-2013, 03:43 AM
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#6
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Quote:
Originally Posted by c3shooter
The creator of a cartridge gets to name it. Those created in Europe were typically named using the metric system. America and Britain, fractions of an inch (.22 is 22/100ths, etc) You will also find OLD names, such as 45-70 that designated caliber of bullet in inch fractions, and the weight of black powder.
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Quote:
Originally Posted by Caveman556
This could be a huge topic. Many make sense, many don't. A quick example is a .38 is really .357....
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C3 pretty much got it there.. The creator of the cartridge gets to name it, even if it doesnt make any sense at all..
The case of the .38 spl is .38 not the bullet. from the days of "Heeled" bullets. 
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...... I suffer from a very rare genetic defect that causes me to be sympathetic toward the International cause. There is no cure.
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03-10-2013, 04:36 AM
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#7
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I've never understood why it is a .460 Rowland instead of a .46 Rowland.
Why .500 S&W, but .50 AE?
Why .38 special, but .380 auto?
I don't get why the zero is like the silent-p in pterodactyl.
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45acp, 40sw, 9mm, 38spl, 380acp, 22lr
12ga, 5.56, 30-30win
2 Chron. 7:14 Christians must seek His face
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03-10-2013, 05:19 AM
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#8
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I'd rather my own son see me die on my feet as a free man, than watch him go, broken, into slavery.
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Quote:
Originally Posted by Jpyle
Thus endith the lesson...
BTW there are 2.54 cm per inch and 25.4 mm per inch, just in case anyone wants to compare .XX" to XX mm. For example a .50 BMG would be approx 13 mm (.5 x 25.4mm). |
I believe a 12.7mm is a foreign answer to our .50bmg. Not saying they're exactly equivalent, just close enough that it's what they built as their equivalent...
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Come if you must, but only if you must. For the day you find yourself upon my step, will surely be the night you find peace along Jordan's edge.
I firmly believe that any man's finest hour, the greatest fulfillement of all that he holds dear, is that moment when he has worked his heart out in a good cause, and lies exhausted on the field of battle... Victorious.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
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03-10-2013, 05:38 AM
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#9
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Game on...
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Quote:
Originally Posted by trip286
I believe a 12.7mm is a foreign answer to our .50bmg. Not saying they're exactly equivalent, just close enough that it's what they built as their equivalent...
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yeah...doing the math a .50 BMG, half an inch, is exactly 12.7 mm
__________________
"The whole of the Bill (of Rights) is a declaration of the right of the people at large or considered as individuals.... It establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." (Albert Gallatin of the New York Historical Society, October 7, 1789)
"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington
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03-10-2013, 06:05 AM
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#10
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I'd rather my own son see me die on my feet as a free man, than watch him go, broken, into slavery.
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Quote:
Originally Posted by Jpyle
yeah...doing the math a .50 BMG, half an inch, is exactly 12.7 mm
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Oh is it? I thought it was off by a couple hundredths or something.
__________________
Come if you must, but only if you must. For the day you find yourself upon my step, will surely be the night you find peace along Jordan's edge.
I firmly believe that any man's finest hour, the greatest fulfillement of all that he holds dear, is that moment when he has worked his heart out in a good cause, and lies exhausted on the field of battle... Victorious.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
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