Whats the difference between these 2 .338 magnums

Discussion in 'The Basics, Starting Out' started by 06mauser, Jul 8, 2008.

  1. 06mauser

    06mauser Active Member

    Mar 31, 2008
    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.

  2. James Jones

    James Jones Well-Known Member

    Jul 1, 2002
    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

  3. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

    Mar 12, 2002
    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.
  4. J E Custom

    J E Custom Well-Known Member

    Jul 29, 2004
    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.
  5. azvarminthunter

    azvarminthunter Member

    Sep 15, 2010
    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.

  6. J E Custom

    J E Custom Well-Known Member

    Jul 29, 2004
    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.