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View Poll Results: So which is the exact milimeter for a .338 Lapua Magnum?
8.58x70mm 10 90.91%
8.58x71mm 1 9.09%
Voters: 11. You may not vote on this poll

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Old July 3, 2011, 01:14 PM   #1
Usertag
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.338 Lapua Magnum?

Ok here is something I have wanted to know for a while. I Know That a .338LM is 8.58mm (8.6). But what gets me is it by 70 or 71. What is the exact milimeter of a .338 Lapua Magnum? So which one is it 8.58x70mm or 8.58x71mm?
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Old July 3, 2011, 01:20 PM   #2
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The 8.58 is the diameter of the projectile, the 70mm is the case length. just like the 7x57, 6.5x55 ect.
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Old July 3, 2011, 02:03 PM   #3
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yeah i know... I want to know the official case diameter. some say it is 70, others say it is 71.
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Old July 3, 2011, 02:18 PM   #4
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It is x70.
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Old July 3, 2011, 03:58 PM   #5
handlerer2
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According to RCBS.load software the case diameter of 338 Lapua is 14.93 mm at the rim. 14.90mm at the base, and 13.81mm at the shoulder. The 70mm refers to case length not diameter.
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Old July 4, 2011, 12:11 AM   #6
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Ok thanks and I know. You all keep on telling me facts I already knew. I was just wondering how long the case was, thats all.
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Old July 4, 2011, 02:08 AM   #7
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Quote:
yeah i know... I want to know the official case diameter.
Quote:
You all keep on telling me facts I already knew. I was just wondering how long the case was, thats all.
Since you already know everything, why are you asking other people? And I know that you know, but I think you should go back and repeat your geometry class.
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Old July 4, 2011, 01:04 PM   #8
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You should stop being a smart aleck. I know the 8.58mm is the projectile width and that "70 or 71" is the case legth. My question was NOT what is the 70 measure. I asked is it "70 or 71"mm long. All people had to say was or vote was "70" or "71". But now i now it it 70mm.
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Old July 5, 2011, 07:49 AM   #9
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Apparently there are some reading comprehension issues. The OP made it very clear the question is case length, 70 or 71mm. The OP later mistyped this "I want to know the official case diameter" He intended length.

Quote:
I know the 8.58mm is the projectile width
diameter would have been more appropriate here.

The .338 Lapua Magnum=(8.6x70mm or 8.58x70mm) it's based on the .416 Rigby.

Last edited by madcratebuilder; July 5, 2011 at 07:55 AM.
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Old July 5, 2011, 03:55 PM   #10
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Thank You Madcratebuilder for understanding the question from the first post.
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Old July 5, 2011, 04:05 PM   #11
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sheesh, tough crowd...

I think we all know that by asking 70mm or 71mm, he was not referring to diameter, but asking about length of the case. 70mm diameter is cannon (tank/howitzer) territory...
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Old July 5, 2011, 04:19 PM   #12
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I would jump on the pile, but I understood his question perfectly
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Old July 5, 2011, 05:31 PM   #13
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Lapua lists it as 8.6 x 70.
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Old July 6, 2011, 10:25 AM   #14
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Why did the OP make it an opinion poll?
(I didn't really think case length for a particular cartridge was subjective.)

Regardless, the answer is 70mm.
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