Another 338 lapua question

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by marioq, May 27, 2013.

  1. marioq

    marioq Well-Known Member

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    Hey guys. Sorry to beat a topic like a dead horse but thing dot seem right

    I'm at the range now. I'm shooting 95.0-95.3 gr RL 33 with fed primers in lapua brass with 300 gr Bergers and my velocity is 2332 ftps.
    I have read 2700 and change with the lapua so I'm thinking in way low on charge but its at max for the books I think. No signs of pressure. I think pull billets and go up cuz I'm wasting valuable resources. What do y'all think???
     
  2. barnesuser28

    barnesuser28 Well-Known Member

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    I think your chronograph is teasing you, if they shoot good then test them out at LR and check your velocity based on drops.
     

  3. marioq

    marioq Well-Known Member

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    Yeah Riley, that's what I thought too but they are not shooting well. I'm at 3.675 and my lands is 3.72 or so.
    So I'm trying to get these damn Bergers to shoot for my 2 elk hunts this year.
    Any ideas from all are welcome.
     
  4. barnesuser28

    barnesuser28 Well-Known Member

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    You might want to try the seating depth test that berger came up with, i dont have a link but i know ICANHITHIMMAN has it in his signature line.
     
  5. WAMBO

    WAMBO Well-Known Member

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    The Alliant data shows a max of 97.5grs of RL33 with a 300gr bullet for the 338 LAPUA MAG


    CASE MIN OAL BBL PRIMER POWDER GRAINS FPS
    Lapua 3.68" 24" Fed 215 Reloder 33 97.5 2,748


    They used a SMK but the Berger has less bearing surface so if your rifle doesn't show pressure signs you might be able to go higher then 97.5grs and if you don't feed them from the magazine definitely seat them out close to the lands.
     
  6. marioq

    marioq Well-Known Member

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    Wow!!!! Thanks for that info. How did u get it??

    You know I am mixed!! I've heard like .010 off the lands to .180 or so. I tried right up there but it shit bad so I backed it off. Maybe I'll try more juice and closer!!!!!
    I went off. RL 25 data as the closest I had for burn rates and backed off 10% and worked up to 95. Guess I'll start at 95.5 and go to 98 or so by 1/2 gr

    Thanks a bunch
     
  7. WAMBO

    WAMBO Well-Known Member

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    I did a search just before I picked up some RL33, found the Alliant Reloading site.

    Alliant Powder - Reloader's Guide

    I can't wait to get out and try some in my 338 LM.
    It has a 30"barrel and I am getting 2800 fps using 91grs of Retumbo under the Berger 300 Hybrid.
    I am hoping to get another 50 fps with the RL33.
     
  8. marioq

    marioq Well-Known Member

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    That is sweet!!! I'm 28 inches. Let u know how it comes out. Think Riley is right. My crony is off!!??
     
  9. J E Custom

    J E Custom Well-Known Member

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    I may be the bullet. Sometimes a rifle/barrel just doesn't like some bullets.

    Try something else like the 300 grain Match King and check your velocities.
    You Can seat them to mag length minus .030 and you should be good to go.

    At least it should tell you if it is the load the bullet or the chroney.

    J E CUSTOM
     
  10. marioq

    marioq Well-Known Member

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    So I also tried 250 Bergers today but stopped when I got the bad velocity. I have some 250 sierras too so I can try that. As for mag length, I think u mean max length???
    So you are talking about my OAL with the hornady OAL gauge and take .030 off that number?
    Just making sure I don't waste more time and powder!!!!

    Hahaha

    Thanks
     
  11. J E Custom

    J E Custom Well-Known Member

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    Actually sometimes more free bore is better. If your chamber is a SAAMI spec. the cartridge OAL
    is not measured at the ogive but the tip of the bullet to the case head. Different bullets measured at the ogive will have different COAL lengths.

    Most manufacturers control the COAL and the free bore with the magazine/Mag well length.

    If you shorten the COAL to Magazine length minus .020 to .030 that will increase free bore and should increase velocity if your chrony is working right.

    Hope this helps

    J E CUSTOM
     
  12. marioq

    marioq Well-Known Member

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    I will try this ASAP!!!

    Thanks a bunch!!!!
    Mario