Why .338 Lapua instead of .338-.378 Weatherby?

This is a discussion on Why .338 Lapua instead of .338-.378 Weatherby? within the Cartridges & Calibers forums, part of the Sniping Related category; Unless an agency is mandating it, why would I build a Lapua instead of the big Weatherby? Brass and dies are expensive for both. Bullets ...

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  1. #1
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    Why .338 Lapua instead of .338-.378 Weatherby?

    Unless an agency is mandating it, why would I build a Lapua instead of the big Weatherby? Brass and dies are expensive for both. Bullets and powder, close enough. Will a Lapua fit in more actions? Little help here...

  2. #2
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    There are many rounds which are quite similar. From my vantage a key difference is that all the Weatherby mags are belted cases while the Lapua does not use a belted case. For headspacing reasons, the belted case is typically considered inferior.

    Most rounds are based on one of a few different "parent" cases. For example, the 243, 7mm-08, 308 are all based on the 308 case. All of the -06 cases (and the 270 Win) are based on the same parent case. The 338 Lapua is based on the 416 Rigby case.

    At some level it involves picking your favorite case and caliber and then finding that round.

    Some people claim "inherent accuracy" of a round, which most don't believe in. A few hundred feet per second in the barrel can really decrease the barrel life. And it also makes a big difference at 1000+ yards...

  3. #3
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    If you want alot of info on both the 338lm and the 338-378 and the
    30-378 i would be more than willing to share from what i have shot all three rounds and found myself. there are alot of cons and pros for all three. its what you are going to be doing with and how often, and your budget.


    Tom

  4. #4
    Senior Member RePete's Avatar
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    There isn't any work to be done with the brass (forming).

    As for the belted brass being inferior, I read an article 15-20 years ago about sizing belted brass, you headspace off the shoulder like beltless brass.

    I can't speak for the accuracy of the Wby round but the Lapua round is accurate.

    I guess it boils down to choose what you like and run with it.

    Ya pays ya money and takes ya chances.
    MFWIC

    Stercus Accidit

    Nice try = you suck spelled differently.

    Proud member of WTFDTSG Club.

    RIP Spike 1996 - 2009

  5. #5
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    On most of the belted cases i load, i take an run the die down tell it touchs and back off one 1/3 turn. it works the neck and nothing else and gives great performance. now the 338lm i do something like that but i mostly just tweak the neck and call it good.
    What i load the 338lm @ IMR 7828 @92 grains. 225grain solid,or Horn. IB now this is really close to max!!!!!!!!!!!!
    Gives great 1000 yard groups and still shootable at 500

    The 338-378 has a nasty recoil compaired to the 338LM
    RL25 @ 111grains. over redline With the same bullet, i've seen this round give better 1500yard groups compaired to the 338LM

    The 30-378 witch i hunt with bench shoot with and gopher hunt with.
    RL25 @ 112 Grains witch is over red line with a 180 Grain Custom bullet. It will shoot 4-6 inches at 1000 if the conditions are right

    But with in large case the cases are spendy bullets are not cheap and powder your dumping in them you could reload 2 1/2 308 cases.

    All in all you have to decide what you want to shoot, how much you want to spend, how much work you want to put into it, and most of all what you will injoy.

    A good 300 win mag will give just as good or better groups at just about any given range up to 1300 yards, and is alot more nicer to the shoulder. and pocket book.

    Thanks Tom

  6. #6
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    Reason number one...BRASS QUALITY.
    Kamrad Tylov


    "Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday."

  7. #7
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    Brass Quality is good but short lived on large cases, my 30-378's and 338-378's i load 5 times and crush it, the 338LM i haven't loaded much of but i have heard about 6 times and same thing, were you can take your 308's 300's 30-06's and load up to 20 or more times if your carefull and watch what your doing.

    Tom

  8. #8
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    Most agencies don't worry too much about handloads I don't think Some do though.

    I'm talking about from the get-go. From what I read, the Lapua can take much more pressure. There is also factory-produced match ammo in .338 LM. That isn't something you can say for the Weatherby or even the .338 RUM.

    I've heard more than one accomplished shooter say, "I'll only develop a wildcat from a cartridge Lapua makes brass for."
    Kamrad Tylov


    "Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday."

  9. #9
    Senior Member billt's Avatar
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    Re: Why .338 Lapua instead of .338-.378 Weatherby?

    Quote Originally Posted by tslewisz
    Unless an agency is mandating it, why would I build a Lapua instead of the big Weatherby? Brass and dies are expensive for both. Bullets and powder, close enough. Will a Lapua fit in more actions? Little help here...


    I agree the .338 Lapua is an over rated round. There is nothing "wrong" with the Lapua round per say, but from a ballistic standpoint the .338-378 Weatherby leaves it in the dust. If the Lapua has any "advantage" it is in the fact they have adopted it as a "Tacticool" round across the pond, while the .338-378 Weatherby remains a "Fudd Gun" round, and that ain't cool! This is my .338-378 Weatherby Accumark. The groups shown were the first shot with it. Since then I've switched to WC-872 Ball Powder along with the excellent 300 Grain Sierra Matchking, and the groups are even better. Scope is a Leupold Vari-X III 6.5-20X in 40MM sitting in Leupold Rings and Bases. I live in Arizona and we have more gun shops here per ca pita than anywhere, and I've yet to see a box of .338 Lapua ammo for sale anywhere. The .338-378 Weatherby is available most everywhere in both ammo, and brass for handloading. Bill T.
    I don't "need" my AR-15 Assault Rifle any more than Rosa Parks "needed" to sit in the front of the bus.

  10. #10
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    so your haven good luck with the ball powerd, i haven't tried manny powders on the monsters but RL25 and BMG powder,

    Tom

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