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Military Firearm Restoration Corner

New 7.62x54r Case Dimensions


gun nutty

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I'm interested in the actual, measured base and COL dimesions on 7.62x54R brass, preferably Norma and Lapua.

 

I've seen recorded base dimensions the range from 0.485 to 0.491. COL is just as bad.

 

And the Norma and Lapua brass... Midway shows a light cannelure grove just forward of the rim. Does this brass actually have that?

 

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I looked under a magnifying glass and could see NO cannelure ahead of the rim or anywhere else for that matter. Here are the measurements I got from five, new, Lapua, 7.62x53R cases;

 

Rim Diameter = .5135

Base Diameter = .486

COL = 2.087 or 53mm

 

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Thanks on the Lapua... I'm still interested in the Norma dimensions as well.

 

Perhaps cannelure is a bad word... "Extraction groove"? He is a linked pic. There is a grove forward of the rim:

 

http://www.midwayusa.com/mediasvr.dll/imag...leitemid=328783

 

That .486 number is interesting. Clymer lists their reamer as .491. That .005"

 

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