338 lapua build

Discussion in 'Long Range Hunting & Shooting' started by goblbustr, Mar 16, 2019.


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  1. goblbustr

    goblbustr Well-Known Member

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    building a 338 Lapua and would like it to be mag fed. from what I am reading you cant feed 300 grain pills through a mag due to length. If this is the case how small do you have to go to be able to use a mag, 285gn., 250gn? would really like to use 300's but don't want to lose the case capacity by seating them deep enough to mag feed. any help?
     
  2. BallisticsGuy

    BallisticsGuy Well-Known Member

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    Weight isn't the deciding factor. Ogive shape is. A round nose is not as long as a VLD.

    Different magazines have different COAL maximums.

    300gr pills feed from mags all day long. Just depends on which mag and which bullet.
     
  3. gohring3006

    gohring3006 Well-Known Member LRH Team Member

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    You spelled 338 Norma mag wrong.
     
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  4. Wolf76

    Wolf76 Well-Known Member

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    That's funny!

    It still doesn't generate the same velocity as the lapua or edge.
     
  5. Quicksilver338

    Quicksilver338 Well-Known Member

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    A 338 Norma improved will equal performance of a 338 Lapua...just a short cased option.
     
  6. Wolf76

    Wolf76 Well-Known Member

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    That's true. Still is kind of silly. Let's fireform brass, get custom dies, so I can shoot the same fps as a standard cartridge. And if you compare with a lapua improved, your still losing.

    For full disclosure, I run a 338 edge, so neither is my first pick.
     
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  7. Quicksilver338

    Quicksilver338 Well-Known Member

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    I shoot a Lapua in my TRG 42 and just single feed the bullets since the mag is relatively short. I will most likely rebarrel in a 338 Lapua improved for single feed once again since it is a target gun. I think in a standard Lapua setup you won’t notice much difference if you throat the barrel to run a dbm setup VS seating them long. For a bdl setup a Wyatt’s 4” box could open up opportunities but also limits your action choices as well. You need dies anyway, and your company you choose to work with will be able to take care of the custom die route and some have dies on the shelf matched to their reamers already so it really isn’t a big deal. There are ways to get exactly what you want, a small sacrifice may have to made here and there but I think your end results will still be satisfying.
     
  8. KyCarl

    KyCarl Well-Known Member LRH Team Member

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    Beg to Differ! My MPA 338BA cycles 300 Gr. ammo just fine.
    But I like the single feed idea simply because it is so much stronger than
    an action with the bottom cut out!
     
  9. Alex Wheeler

    Alex Wheeler Well-Known Member

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    If I just HAD to mag feed a Lapua if would be 250 Bergers. Run the ballistics on them VS a 300. Id prefer them out to 1k.
     
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  10. Alex Wheeler

    Alex Wheeler Well-Known Member

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    Guy in the yellow shirt is shooting a 338 lapua improved single shot. They are not slow.

     
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  11. ATH

    ATH Well-Known Member

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    It depends on your action and how badly you want to feed from the mag. My 338 Edge is a Stiller action and the mag is BDL style hinged floorplate. I got the Wyatt's 4in box and used a Dremel (!!) to carefully extend the mag opening in the action backwards until the box fit. Then I modified the bolt stop to allow the bolt to come back further and pick up the rear of the round. It feeds just fine.
     
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  12. snox801

    snox801 Well-Known Member

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    I turned both my .375 and lapua improved into single shots by running monos. Oh well. I think when you get to that size case you really don’t need anything but a single feed.
     
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  13. oja0530

    oja0530 Active Member

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    You can feed 300 gr pills, from a mag. I have custom 338, and that's all I use. They feed great.
     
  14. Alex Wheeler

    Alex Wheeler Well-Known Member

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    A 338 Lapua with a 300 Berger seated out properly is about 4" oal.
     
    C.O. Shooter likes this.