Caliber Conversion Chart

'88Scrat · April 12, 2012, 07:16 PM

Title pretty well sums it up really. Does anyone know where I can find a chart that will tell what a caliber translates in the metric system?

A few I know for sure are that a 9mm = .36 and a .50 = 12.7mm

zoomie · April 12, 2012, 07:19 PM

1 inch = 25.4 mm. The rest is just math. What are you looking for? Any inch to mm table will do what you want.

http://www.engineeringtoolbox.com/in...ion-d_751.html

James K · April 12, 2012, 07:26 PM

If all you want is to "translate" a bullet diameter from one system to the other, there are on-line conversion sites that will do the job for you. But all they will do is tell you that ".38 inch" translates to 9.66 mm. They won't tell you that a .38 Special bullet is really .357" or that .38 Special is not the same as .38 S&W. Or they will tell you that 9mm is .354", but not that 9mm Largo isn't the same as 9mm Steyr, but is the same as 9mm Bergman-Bayard.

If you want to find out what a U.S. cartridge is called in Europe or vice versa (like 7.62x63 is .30-'06) then you need a book like Cartridges of the World.

Jim

emcon5 · April 14, 2012, 01:28 AM

Here is a good place to start:

http://en.wikipedia.org/wiki/List_of...ges_by_caliber
http://en.wikipedia.org/wiki/List_of_handgun_cartridges
http://en.wikipedia.org/wiki/List_of_rifle_cartridges

mapsjanhere · April 14, 2012, 08:04 AM

all the metric data you ever need

gyvel · April 14, 2012, 08:52 AM

Interestingly enough, that chart lists the .303 Savage as having a .311 diameter bullet.

mapsjanhere · April 14, 2012, 11:25 AM

That's because .311 is SAAMI spec; 308 is just what everyone uses, according to Barnes's Cartridges of the World.

MLeake · April 14, 2012, 12:56 PM

I had thought that with the .308, the lands of the rifling were .308, while the bullet was actually .311; I could be mistaken.

mapsjanhere · April 14, 2012, 01:35 PM

No, in a 308 Win, the lands are .300, the bullet .308 (which is why for a .303 a .311 bullet diameter is reasonable).

April 12, 2012, 07:16 PM	#1
'88Scrat Senior Member Join Date: July 11, 2011 Location: Kansas Posts: 549	Caliber Conversion Chart Title pretty well sums it up really. Does anyone know where I can find a chart that will tell what a caliber translates in the metric system? A few I know for sure are that a 9mm = .36 and a .50 = 12.7mm __________________ BOOM

April 14, 2012, 08:04 AM	#5
mapsjanhere Senior Member Join Date: August 6, 2009 Location: Albuquerque Posts: 2,832	all the metric data you ever need __________________ I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.

April 14, 2012, 11:25 AM	#7
mapsjanhere Senior Member Join Date: August 6, 2009 Location: Albuquerque Posts: 2,832	That's because .311 is SAAMI spec; 308 is just what everyone uses, according to Barnes's Cartridges of the World. __________________ I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.

April 14, 2012, 01:35 PM	#9
mapsjanhere Senior Member Join Date: August 6, 2009 Location: Albuquerque Posts: 2,832	No, in a 308 Win, the lands are .300, the bullet .308 (which is why for a .303 a .311 bullet diameter is reasonable). __________________ I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.

April 12, 2012, 07:19 PM	#2
zoomie Senior Member Join Date: January 23, 2006 Location: GA Posts: 1,864	1 inch = 25.4 mm. The rest is just math. What are you looking for? Any inch to mm table will do what you want. http://www.engineeringtoolbox.com/in...ion-d_751.html

April 12, 2012, 07:26 PM	#3
James K Member In Memoriam Join Date: March 17, 1999 Posts: 24,383	If all you want is to "translate" a bullet diameter from one system to the other, there are on-line conversion sites that will do the job for you. But all they will do is tell you that ".38 inch" translates to 9.66 mm. They won't tell you that a .38 Special bullet is really .357" or that .38 Special is not the same as .38 S&W. Or they will tell you that 9mm is .354", but not that 9mm Largo isn't the same as 9mm Steyr, but is the same as 9mm Bergman-Bayard. If you want to find out what a U.S. cartridge is called in Europe or vice versa (like 7.62x63 is .30-'06) then you need a book like Cartridges of the World. Jim

April 14, 2012, 01:28 AM	#4
emcon5 Senior Member Join Date: July 10, 1999 Location: High Desert NV Posts: 2,850	Here is a good place to start: http://en.wikipedia.org/wiki/List_of...ges_by_caliber http://en.wikipedia.org/wiki/List_of_handgun_cartridges http://en.wikipedia.org/wiki/List_of_rifle_cartridges

April 14, 2012, 08:52 AM	#6
gyvel Senior Member Join Date: August 30, 2009 Location: Northern AZ Posts: 7,172	Interestingly enough, that chart lists the .303 Savage as having a .311 diameter bullet.

April 14, 2012, 12:56 PM	#8
MLeake Senior Member Join Date: November 15, 2007 Location: Outside KC, MO Posts: 10,128	I had thought that with the .308, the lands of the rifling were .308, while the bullet was actually .311; I could be mistaken.