.338 Lapua Magnum?

Usertag · July 3, 2011, 01:14 PM

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?

handlerer2 · July 3, 2011, 01:20 PM

The 8.58 is the diameter of the projectile, the 70mm is the case length. just like the 7x57, 6.5x55 ect.

Usertag · July 3, 2011, 02:03 PM

yeah i know... I want to know the official case diameter. some say it is 70, others say it is 71.

ripnbst · July 3, 2011, 02:18 PM

It is x70.

handlerer2 · July 3, 2011, 03:58 PM

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.

Usertag · July 4, 2011, 12:11 AM

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.

Scorch · July 4, 2011, 02:08 AM

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.

Usertag · July 4, 2011, 01:04 PM

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.

madcratebuilder · July 5, 2011, 07:49 AM

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.

Usertag · July 5, 2011, 03:55 PM

Thank You Madcratebuilder for understanding the question from the first post.

precision_shooter · July 5, 2011, 04:05 PM

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...

publius · July 5, 2011, 04:19 PM

I would jump on the pile, but I understood his question perfectly

T. O'Heir · July 5, 2011, 05:31 PM

Lapua lists it as 8.6 x 70.

EdInk · July 6, 2011, 10:25 AM

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.

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

July 3, 2011, 01:14 PM	#1
Usertag Senior Member Join Date: January 1, 2011 Location: Louisville Posts: 261	.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?

July 5, 2011, 04:05 PM	#11
precision_shooter Senior Member Join Date: September 8, 2007 Location: DFW, Texas Posts: 2,475	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... __________________ "Laws that forbid the carrying of arms...disarm only those who are neither inclined nor determined to commit crimes...Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man." - Thomas Jefferson, 1776

July 5, 2011, 04:19 PM	#12
publius Senior Member Join Date: January 25, 2005 Location: Mississippi/Texas Posts: 2,505	I would jump on the pile, but I understood his question perfectly __________________ "Suppose you were an idiot, and suppose you were a member of Congress, but I repeat myself." Mark Twain

July 5, 2011, 05:31 PM	#13
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	Lapua lists it as 8.6 x 70. __________________ Spelling and grammar count!

July 3, 2011, 01:20 PM	#2
handlerer2 Senior Member Join Date: April 26, 2010 Location: Yellowstone Co, MT Posts: 489	The 8.58 is the diameter of the projectile, the 70mm is the case length. just like the 7x57, 6.5x55 ect.

July 3, 2011, 02:03 PM	#3
Usertag Senior Member Join Date: January 1, 2011 Location: Louisville Posts: 261	yeah i know... I want to know the official case diameter. some say it is 70, others say it is 71.

July 3, 2011, 02:18 PM	#4
ripnbst Senior Member Join Date: November 24, 2010 Location: Spring, TX Posts: 1,552	It is x70.

July 3, 2011, 03:58 PM	#5
handlerer2 Senior Member Join Date: April 26, 2010 Location: Yellowstone Co, MT Posts: 489	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.

July 4, 2011, 12:11 AM	#6
Usertag Senior Member Join Date: January 1, 2011 Location: Louisville Posts: 261	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.

July 4, 2011, 01:04 PM	#8
Usertag Senior Member Join Date: January 1, 2011 Location: Louisville Posts: 261	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.

July 5, 2011, 03:55 PM	#10
Usertag Senior Member Join Date: January 1, 2011 Location: Louisville Posts: 261	Thank You Madcratebuilder for understanding the question from the first post.

July 6, 2011, 10:25 AM	#14
EdInk Senior Member Join Date: May 27, 2009 Posts: 3,968	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. __________________ Sic Semper Tyrannis