338 Lapua Ackley Improved Load Help

Discussion in 'Reloading' started by SHRTSHTR, Apr 24, 2010.

  1. SHRTSHTR

    SHRTSHTR Well-Known Member

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    Hi,

    I will be converting my 338LM to a Ackley Improved 40 degree shoulder. The barrel is a Lilja, 30" 1-10 Twist, #8 Contour. I think that H1000 or Retumbo are good choices but would like to hear what you gents have to say. Plan on sticking with the 300 smk's.
    Need info like, Primers, Charge weight, how far off the lands, etc. Thanks in advance.

    Ray
     
  2. 6mm Shooter

    6mm Shooter Well-Known Member

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    Jul 21, 2007
    I shoot 110gr of US869 out of mine. 30" Brux and I get 3030fps with 300gr MK. I use Federal Match primers and load the bullets 10thou off the lands.
     

  3. SHRTSHTR

    SHRTSHTR Well-Known Member

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    510
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    Aug 29, 2008
    Wow, that is very impressive! I doubt that I will achive that out of a Lilja Barrel as they seem to have a tighter bore than most.
    My 338 Lapua was getting 2725fps when new. After a couple hundred round, it jumped to 2750fps, 90gn. H1000. I would be happy with these same numbers in the 2900's.
     
  4. jwp475

    jwp475 Well-Known Member

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    How do you like the 40 degree shoulder?
     
  5. jmden

    jmden Well-Known Member

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    Hi 6mm,

    How many loads do you figure you'll get out of those cases?

    How's the accuracy at longer ranges?

    Have you tried that load over a wide range of temps? Curious how 869 would do in that chambering with that bullet over a wider range of temps. My experience with it in the 300RUM shooting 240's was that it was pretty temp sensitive. But it seems some are getting very good velocities with it. I know 'long ranger' up in Canada ( Alberta Tactical Rifle Supply ) shoots just a bit stiffer load than that and has many, many firings on the same cases.
     
  6. SHRTSHTR

    SHRTSHTR Well-Known Member

    Messages:
    510
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    Aug 29, 2008
    jwp475,

    Do you have experience with something other than a 40 degree shoulder?

    I too am interested in US869. I would like to stick with a powder that temp insensitive, this why I asked about Retumbo and H1000.
     
  7. RockZ

    RockZ Well-Known Member

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    I have only shot the 300 SMK's in the fireforming loads and I am using 94 gr Retumbo loaded at 3.710 OAL which is .010 off the lands.
    I know alot of people who fireform with the bullet in the lands but this worked out for me as a very accurate usable load. 3 shots in 1/4"at 100yds.

    I never shot the 300 SMK's in fireformed brass but am going to do that in the next month or so.
    I just ordered 500 of them from Midway and should get them next week.

    So far in fireforming, Retumbo showed more accuracy than US869 for my rifle. But I haven't given it a very extensive test yet.

    I have a buddy with a 7MMRUM who uses US 869 and it has been the best powder by far in that cartridge. I too am interested in building a 7RUM.
     
  8. jwp475

    jwp475 Well-Known Member

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    In my mind it is too steep, I am thinking of an AI with a 35 degree shoulder, thus my question. Does the 40 degre shoulder give you any problems?
     
    Last edited: Apr 25, 2010
  9. 6mm Shooter

    6mm Shooter Well-Known Member

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    My rifle is a single shot so the shoulder does not hinder feeding for me and there is no problems when setting the shoulder back.

    As far as brass life I have not had any failures yet but I only have 4 firings on 50 pieces.
     
  10. superpete

    superpete New Member

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  11. JeffVN

    JeffVN Well-Known Member

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    I run either VV570 or RL-33 in my 338 LM Improved (40 degree shoulder - single shot), pushing 300 SMKs, 300 Lapua SC, or 300 Bergers to 3,000 fps w/o pressure. My current lot of brass has right at 12 reloads on it.

    Avoid max pressures and anneal, anneal, anneal.

    JeffVN
     
  12. alcesgigas

    alcesgigas Well-Known Member

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    Go here: .338 Terminator - AmmoGuide Interactive
    I thought I put this info on this site; will now.

    My rifle is a "second generation" 338 Terminator + P. Your rifle should perform similar or maybe just a little slower because it isn't a P chamber; maybe slower yet due the Lilja barrel. I say MAYBE, who knows until it's tried.

    Hope this helps.