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gun nutty

New 7.62x54r Case Dimensions

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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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Heres my Norma specs off 50 new cases rim .562 to .563, base above rim .485, length 2.09 to 2.092 and yes the extractor groove is on norma brass is .473 to .474. hope that helps aaron

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