.22 cal. LR Bore Diameter
- Thread starter AntiSpin
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http://www.chuckhawks.com/22_rimfire_cartridges.htm
I'd consider Chuck Hawks a pretty reliable resource.
I'd consider Chuck Hawks a pretty reliable resource.
22-rimfire
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Where in that article is the answer provided although it is a nice history lesson?
ArfinGreebly
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For the actual cartridge itself, see here.
The actual standards document (page 13), found at SAAMI, specifies the barrel diameter in their drawings as:
SAAMI is the standard, the baseline reference. Manufacturers will vary from this according to their performance requirements.
For example, the 10/22 barrels listed here are specified at .2215" groove diameter. These are match barrels, and will be ever-so-slightly smaller than the factory diameter.
For the actual cartridge itself, see here.
The actual standards document (page 13), found at SAAMI, specifies the barrel diameter in their drawings as:
. . . while the bullet diameter is listed as .2255 inches, in a case having a diameter of .226 inches.
SAAMI is the standard, the baseline reference. Manufacturers will vary from this according to their performance requirements.
For example, the 10/22 barrels listed here are specified at .2215" groove diameter. These are match barrels, and will be ever-so-slightly smaller than the factory diameter.
22-rimfire
Member
You will find that some manufacturers spec their 22 handgun barrels at 0.224". Colt started doing this after the 22 WMR came out in 1959 and where you have a dual cylinder revolver it makes sense, but it has caused some concern with Colt folks for regular chambered 22 revolvers such as the Diamondback. I believe the Officers Model Target has always been 0.222"-.223" as I recall. I suspect Ruger does exactly the same thing with their convertable Single Six.
Added: If you are interested in this kind of thing, you need to slug your barrel. But there seems to be no correct answer in terms of barrel diameter.
Also you will find that some 22 rifles will have the chamber manufactured to different tolerances which affects accuracy. This is where the term "match chamber" and so forth comes from.
Added: If you are interested in this kind of thing, you need to slug your barrel. But there seems to be no correct answer in terms of barrel diameter.
Also you will find that some 22 rifles will have the chamber manufactured to different tolerances which affects accuracy. This is where the term "match chamber" and so forth comes from.
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ArfinGreebly
Moderator Emeritus
Page 13
For those who (for whatever reason) can't reach the SAAMI document, here's an image grab of page 13:
Apologize for graphic quality, but it's ripped from a PDF.
For those who (for whatever reason) can't reach the SAAMI document, here's an image grab of page 13:
Apologize for graphic quality, but it's ripped from a PDF.
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