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Whats the difference between these 2 .338 magnums

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  #1  
Unread 07-08-2008, 07:56 AM
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Whats the difference between these 2 .338 magnums

Do any of you guys know what the real difference between a .338 express (aka .338-.404 jeffries) and the .338 EDGE. I know that both catridges are built off of the .404 jeffries case but I am having a hard time trying to find the case dimension of these cartridges to compare.

Thanks
Ian
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  •   #2  
    Unread 07-08-2008, 09:07 AM
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    I would say not much at all , the 404 necked down to the 338 might hold a little more powder , I think the RUM cases are a little shorter that the parrent 404 but I could be wrong
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      #3  
    Unread 07-08-2008, 03:00 PM
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    James I think they are a little shorter so remington could fit them into their current actions instead of designing a new one for the ultramag which is what they should have done. The other difference is that neither is as powerful as the 338-378 or the 338-416 rigby so what does it matter. Just kidding, I like the fact that much power will fit on my sako actions.
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      #4  
    Unread 07-08-2008, 03:13 PM
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    My guess is that the .338 Express uses the 404 case necked down.

    This would make the 338 Express have a rim dia. of .537 and it has a shorter
    case body ( Less powder capacity than the .338 Edge )

    There is a cartrige called the .338 Abe Express that has a rim dia.
    of .541 an a case length of 2.240.

    Also I think the Edge is based on a 300 RUM case with a .534 rim dia.
    ( standard magnum bolt face )

    The .338 RUM is shorter than all other RUM's ( Case length is 2.295 with
    a over all case length of 3.60 )

    The other RUM's have a case length of 2.845 and the same 3.60 overall case
    length to fit in the magnum length actions.Note: what I'm calling 'over all case
    length' is just the brass not the loaded round!!!!!

    I looked into the Dakota rifles and they use the 404 case on most of thier
    rifles and they had a case head dia. of (.545 )
    requiring opening the bolt face on all standard magnum bolts.

    If I am wrong about any of this please correct me.
    J E CUSTOM
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      #5  
    Unread 09-15-2010, 05:56 PM
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    Re: Whats the difference between these 2 .338 magnums

    I was Googling 338 Abe Express and this forum showed your post. Did you ever build a 338 magnum? I've been shooting a 338 Abe Express since 1981. I have read about the 338 Edge and downloaded a general document.

    I primarily shot 250 grain Nosler Partitions during the '80s and early 90's. Currently I have moved down to the 225 grain Nosler. Haven't tried any of the newer Barnes or Hornady mono bullets. I had 3 barreled actions made up, two on Sako actions and one Mauser.

    azvarminthunter
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      #6  
    Unread 09-15-2010, 07:18 PM
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    Re: Whats the difference between these 2 .338 magnums

    Quote:
    Originally Posted by 06mauser View Post
    Do any of you guys know what the real difference between a .338 express (aka .338-.404 jeffries) and the .338 EDGE. I know that both catridges are built off of the .404 jeffries case but I am having a hard time trying to find the case dimension of these cartridges to compare.

    Thanks
    Ian
    Ian
    The 404 Jeffery's is a rimless case with a head dia. of.537.
    the body is only 2.000 long with a long shoulder and a neck length of .620.

    The 338 ABE is based on the Jeffery's but has a case head dia. of .541 and
    a much longer body (2.240 ) and a neck length of .375 .

    The 338 Edge is a necked up 300 RUM and is also based off the 404 case except
    that Remington made it into a rebated rim case by turning the case head down
    to.534 and the body blown out to .550 with .011 of total body taper and body
    length of 2.387 and a neck length of .306 giving it more case capacity than the
    404 or the ABE.

    Hope this helps.

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