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New 7.62x54r Case Dimensions


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#1 gun nutty

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Posted 06 November 2006 - 05:03 PM

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?


#2 BEJ

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Posted 06 November 2006 - 08:49 PM

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


#3 gun nutty

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Posted 06 November 2006 - 10:27 PM

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...leitemid=328783

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


#4 BEJ

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Posted 07 November 2006 - 05:47 AM

I'm not sure what you see in the picture, but my cases are full body diameter right down to the rim.

#5 aaron10

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Posted 07 November 2006 - 10:26 AM

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

#6 gun nutty

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Posted 07 November 2006 - 10:50 AM

Excellent! So, the Norma brass has the groove.

So I'm seeing a base of .485-.486 for Norma and Lapua brass.

Thank you. Very good info.

#7 BEJ

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Posted 07 November 2006 - 03:14 PM

Looks like I was a couple of ticks off on the rim measurement. I went back and got a .5635 on my Lapua cases.




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