338 lapua AI 40 degree load help

Discussion in 'Reloading' started by Jim See, Oct 8, 2013.

  1. Jim See

    Jim See Well-Known Member

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    Fireforming loads with 92 grains of H1000 and 300 smk shot into less than 1" at 300 yards at 2700 fps

    Using the formed brass I am strugling to stay at 3/4 moa.

    using the area of 96-98 grains of H1000 and velocity in a 29" barrel is around 2800fps. like I said accuracy is sub-par.

    Is there a higher pressure node I should be in? not sure how high I should go.

    loaded up 104 grains of Retumbo today and will give that a go tommorow.

    any advice?
     
  2. Broz

    Broz Well-Known Member

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    Jim I think you need to go higher. I have run 92.5 gr of H1000 with 300 SMKs in my standard Lapua. You should get close to 2950 with H-1000 from the AI. 100 gr of VV N-570 will get you close to 3000.


    One more thing. 90% of the .338's I have done will take a 3/4" load at 100 yds and print the same 3/4" group at 300 yds.

    I don't spend much time at 100 yards with a 338 and a 300 Berger or a 300 SMK.

    Jeff
     

  3. Jim See

    Jim See Well-Known Member

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    Thanks Jeff, Since my move I am limited on a longer range to shoot at. having 600 yards outside my back-door spoiled me.

    I will shoot them at 300, I have a spot to confirm trajectory at 1100 but it takes a few phone calls to get in. The only bergers i have is the original 300 OTM that i picked up when they first came out. I will shoot the Retumbo load and work it up again if this trial doesn't perform.

    Elk hunt in less than 2 weeks and I'm cutting it close.
     
  4. Broz

    Broz Well-Known Member

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    Jim, just stick with the SMk's. I think you would be on the edge of the Gen 1 Berger 300's coming apart. You should get a good load with Retumbo and the 300 SMK. Just watch for the Retumbo spikes. Probably won't be an issue with the AI and fall temps. .065" off lands was a sweet spot for me with the SMK. And they liked a max load.

    Jeff
     
  5. Jim See

    Jim See Well-Known Member

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    Jeff, I worked up a good load that is running 3009 with 300 OTM, (2nd generation found a couple boxes.) using Retumbo.
    I showed some slight ejector marks at 3060 so backed down a grain and a half. test shot 1" verticle at 300. I'm calling that good for elk ;-)

    This weekend I am shooting 600 and 1100 for trajectory validation and going hunting.

    Thanks for the help,
    Jim
     
  6. Broz

    Broz Well-Known Member

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    That will work Jim. Glad you got her going, but I knew you would.:)

    Good luck on your hunt.

    Jeff
     
  7. kaseyfied

    kaseyfied Well-Known Member

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    dsmmit.. u guys r going to make me build another lapua with those velocities!!!!!!

    kasey
     
  8. Jim See

    Jim See Well-Known Member

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    I must say mine is a single shot with a .250" free-bore.
     
  9. RockyMtnMT

    RockyMtnMT Official LRH Sponsor

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    Boy do I understand that feeling of leaving in two weeks and still trying to get the load working. Feels real good when it starts to work.gun)

    Steve
     
  10. Kiwi Greg

    Kiwi Greg Well-Known Member

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    If you want to see some velocity give RL33 a go :)


    I see that you are already :)

    It really perks the 338 Imp up.
     
  11. JeffVN

    JeffVN Well-Known Member

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    Retumbo & 300 gr. SMKs worked fine in my 338LM Improved, but she liked VV570 a lot better & a bunch faster. Unfortunately VV570 is darn near impossible to find these days, so I am looking to test some RL-33 next.

    JeffVN