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Would the true 7mm please stand up!!!

 
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  #15  
Old 02-11-2008, 05:41 PM
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Join Date: Jul 2007
Posts: 137
Is there really a true 7mm. I've done some looking this afternoon and I have found at least 18 calibers that are or are based on the 7mm.

Everything from:
.280
.284
7mm-08
7mm TCU
7mm IHMSA
7mm stw
7mm Rem. Mag.
7mm Weath. Mag.
7mm x 47
7mm x 61

The list is numerous.


Mike Alford
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  #16  
Old 02-12-2008, 09:55 PM
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Join Date: Feb 2008
Location: Kennewick,Wa.
Posts: 61
Quote:
Originally Posted by tjonh2001 View Post
guys i have had great luck reloading my brothers kimber 270 wsm and it likes 7828ssc give it a try we have had great luck with it.
Thank for the info. What primer and bullet weight are you using?
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  #17  
Old 02-12-2008, 10:39 PM
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Join Date: Jul 2004
Location: Texas
Posts: 5,438
Mikenc

I only found a few rounds that were not .284 .

6.8x57 chinese .277 dia (the only other one except the winchester
and 4or 5 wildcats).
280 british .283 dia
276 pederson .285 dia
7.35 mm carcano .298 dia. (The right designation but the wrong Dia).

As far as I can tell there are no true 7mm (.275.5) cartriges.

Very Interesting
J E CUSTOM
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  #18  
Old 02-14-2008, 09:09 AM
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Posts: 137
Quote:
Originally Posted by J E Custom View Post
Mikenc

I only found a few rounds that were not .284 .

6.8x57 chinese .277 dia (the only other one except the winchester
and 4or 5 wildcats).
280 british .283 dia
276 pederson .285 dia
7.35 mm carcano .298 dia. (The right designation but the wrong Dia).

As far as I can tell there are no true 7mm (.275.5) cartriges.

Very Interesting
J E CUSTOM

I agree, there does not seem to be a true 7mm. The calibers and chambering I am currently looking at are in the R W Hart calalog. You as a custom builder probably are very aware of Bob Hart. To start with the .280 remington and carrying on to the 7mm-300 with at least 16 choices between. It seems there are many many variations of the 7mm.

I suppose it's like everything else, personal choice/preference.


Mike Alford

Last edited by mikenc; 02-14-2008 at 12:49 PM.
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  #19  
Old 02-14-2008, 12:27 PM
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Join Date: Feb 2008
Posts: 16
why does remington call their 270 cartridge a 6.8?
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  #20  
Old 02-16-2008, 02:59 PM
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Join Date: Jul 2007
Posts: 7
.270win is the real 6.8mm?

Quote:
Originally Posted by James H View Post
For those that don't know.
The bore diameter of a 7mm/.284cal is .277 hence the 7mm designation.
James

I agree with James.

Example: 308win has a bullet diameter of .308 but the bore diameter is .300 which converts to 7.62mm as everyone knows.

So when it comes to the 270win sure the bullet diameter is .277 = roughly 7mm but the bore diameter is still only .270 so that means that the .270win is not the real 7mm but it is the real 6.8mm if that helps.

So next time someone has an argument about this ask if there talking about the bullet diameter or the bore diameter.

I don't really care one way or another but I'm glad I read this thread anyway because finding out that berger has a .277 150gr VLD kicks ass!!!!!

Dave
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  #21  
Old 02-18-2008, 01:45 AM
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Join Date: Oct 2007
Posts: 60
sectional density

If the bore diameter is .270 and the bullets are .277 then it stands to reason that the bullets are "squeezed" down the barrell as they bite into the rifling. Does that then mean that the SD of the bullet changes as it is forced down a slightly narrower tube on its way to the target? If we measured the bullet diameter after it was shot, what would it be?
You have got me thinking!
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