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338-404 Jef

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  #1  
Unread 09-18-2007, 12:25 AM
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338-404 Jef

I was hoping for some help finding info on what has been done on the 404 Jeffery. I only know it parented the RUM family.
Remington shortened it, I do not wish to do so, otherwise I would use the ultra mag brass. The general idea is a .338 neck both long and wide with a 35 deg shoulder and minimal taper to be used in a Wby Mk V origenaly chambered in 300 Win Mag.
I was directed here by 30-338, on the Reload Board, that fiftydriver may be able to help. Any one that has an idea please chime in! This looks to be a great board and is right up my ally.
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  •   #2  
    Unread 09-19-2007, 09:35 AM
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    You might want to talk to Randy Selby from WY. He build rifles on the 404 case. Randy's Custom Rifles&Rebarreling :: Custom Rifles. He did a fine job on a Sako 75 in 270 WSM.
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      #3  
    Unread 09-19-2007, 10:10 AM
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    Quote:
    Originally Posted by Rex Rat View Post
    I was hoping for some help finding info on what has been done on the 404 Jeffery. I only know it parented the RUM family.
    Remington shortened it, I do not wish to do so, otherwise I would use the ultra mag brass. The general idea is a .338 neck both long and wide with a 35 deg shoulder and minimal taper to be used in a Wby Mk V origenaly chambered in 300 Win Mag.
    I was directed here by 30-338, on the Reload Board, that fiftydriver may be able to help. Any one that has an idea please chime in! This looks to be a great board and is right up my ally.


    The only RUM case that Rem. shortened was the 338 case,the 7mm RUM, 300 RUM and 375 Rum are not shortened.. Remington did reduce the size of the case head inorder for it to fit the same bolt face as the other mag. cartridges allready in existence.......
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      #4  
    Unread 09-19-2007, 10:54 AM
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    You could go with the 338 Edge which is basically the 300 RUM necked up to 338. This is the full length RUM case not the shortened one used on the 338 RUM.

    Performance would be identical to that of the 338 Lapua but better suited for standard magnum bolt faced rifles.

    Only problem with your rifle would be if the magazine is long enough and if not, getting a replacement mag box for the Wby. Wby is not overly happy to send out parts and it can be a real challange to get parts to modify the Wby rifles.

    To be brutally honest, I would sell the Wby, take that money and get a Rem 700 for this build, in the end, you would be much better off with a properly built Rem 700 over the Wby. Only so much can be done to the Wbys to get them to shoot and even then, some can be extremely finicky. This is generally not so with a properly built Rem 700 plus you can use the much longer custom mag boxes as well which are best for this type of round.

    With the 338 Edge out there, I could never recommend a 338-404 Jeff because of extreme cost in dies and brass which is also hard to get. 300 RUM brass is everywhere!!

    Kirby Allen(50)
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      #5  
    Unread 09-19-2007, 11:19 AM
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    Go to Mark King in PA, his info is found on www.6mmbr.com as one of the top recommended gunsmiths. He is a long time LR gun builder, 1k competitor and builds LR guns on the 404 and shoots them at the mile matches.

    BH
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      #6  
    Unread 09-19-2007, 11:42 AM
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    Quote:
    Originally Posted by BountyHunter View Post
    Go to Mark King in PA, his info is found on www.6mmbr.com as one of the top recommended gunsmiths. He is a long time LR gun builder, 1k competitor and builds LR guns on the 404 and shoots them at the mile matches.

    BH


    Feel free to explain exactly what can be gained by useing a 404 Jeffery case that can not be achieved by useing a 300 RUM case,since it is also based on a 404 Jeffery case........
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      #7  
    Unread 09-19-2007, 12:46 PM
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    All of the RUM case's except the 338 are the same as the 404jeffers
    in length but as JWP said, the head is larger and requires some bolt
    face opening. also the 404 case has a longer neck and around 20 degrees
    of sholder Reducing powder capacity.

    I build more rifles on Remingtion actions than anything else but if you
    allready have a Weatherby MK5 action I would use it ,and it has a longer
    magazine than the Remingtion (.100 ) allowing bullets to be seated longer
    on a fule size RUM case.

    I agree with fifty on the 300 RUM necked up to 338 You only lose
    about .001 to .002 thou in neck thickness, and you have a standard
    mag bolt face.

    I built a 338 RUM on a MK 5 so i could shoot 300gr SMK's an seat them
    longer saveing powder space. and shooting factory or standard length
    rounds I have lots of room in the magazine.

    J E CUSTOM
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