Accuracy issues with a custom 338 Laupa

Discussion in 'Reloading' started by kdumph, Apr 26, 2014.

  1. kdumph

    kdumph Well-Known Member

    Messages:
    76
    Joined:
    Jul 5, 2013
    Got my first long range hunting rifle from Snowy Mountain Rifles a few months ago and simply can't get her to group like I know she should. Have about 100 rounds down the barrel now.

    Rifle info
    1:10 Twist 28" Remington Varmint Contour Barrel
    SMR 416 muzzle break
    NXS 5.5-22
    Manners MCS-TA
    TS-100 SS Series in 338 Lapua.

    Hand Load Info.
    300gr Sierra Matchkings
    89Gr(2700fps) & 93GR (2800fps) loads of Retumbo
    Tried 4 different lengths from 3.950 up to 3.979
    Laupa brass
    Rem 9 1/2 Mag primers

    300gr Berger Hybrid OTMs
    93gr Retumbo (2800fps)
    Tried 3 different lengths, kissing the lands, slightly off the lands, and magazine length.
    Laupa brass
    Rem 9 1/2 Mag primers

    Have done a ladder test at 200 yards that didn't work very well, but my max load with a heavy bolt lift is 94gr with the the SMKs.

    Even with all the variations I have tried the rifle shoots extremely consistently, just not very good groups. Best group I think I have had at 200 yards is about 1 1/2".

    I'm kinda at a loss now to get these groups tighter. I have been following this guide pretty closely for the loading technique. Hand Loading for Long Range 1: Brass Prep

    Perhaps another powder, bullet? With the fired brass length I am still about .20 off of what my max headspace measurement is. My last 2 reloads I have just selected my shortest round and trimmed to its length for consistency. Perhaps I should just not trim until I get up to that max length?

    Forgot to add that on my second reloads on this new Lapua brass the case is slightly stiff when chambered even though I knocked the neck back.

    Id be extremely grateful for any suggestions you guys may have!
     

    Attached Files:

  2. Korhil78

    Korhil78 Well-Known Member

    Messages:
    1,829
    Joined:
    Jun 22, 2011
    Well, it seems like you have tried everything. I don't know who you are so I don't know how experienced you are as a shooter. Do you know someone that is quite a good shooter? If so, let them try shooting the same loads that you think are most accurate in your rifle and see how he fairs. Then if he shoots around the same size groups, you will know that it wasn't you mucking it up.

    If it still doesn't look good, I would send it back to Snowy Mountain Rifles and have them take a look at it and shoot it.
     

  3. WyoElk2Hunt

    WyoElk2Hunt Well-Known Member

    Messages:
    1,193
    Joined:
    Aug 15, 2009
    My load is:
    Lapua brass
    Fed 215 Primer
    90 grs H1000
    300 gr Berger Hunting VLD
    2875 FPS
    COAL is 3.080
    Works great for me.gun)
     
    Last edited: Apr 26, 2014
  4. Korhil78

    Korhil78 Well-Known Member

    Messages:
    1,829
    Joined:
    Jun 22, 2011
    You are getting 2875 fps out of 90 gr of H1000? How long is your barrel?
     
  5. WyoElk2Hunt

    WyoElk2Hunt Well-Known Member

    Messages:
    1,193
    Joined:
    Aug 15, 2009
    It is 28 inches. McMillan EOL LRH rifle.
     
  6. Bigcat_hunter

    Bigcat_hunter Well-Known Member

    Messages:
    426
    Joined:
    Dec 8, 2006
    What is your trigger pull weight? I have my long range rig set at 14oz. A heavy pull will notnhelp groups.
     
  7. kdumph

    kdumph Well-Known Member

    Messages:
    76
    Joined:
    Jul 5, 2013
    Trigger should be around 2.5 since this is my hunting rifle. It's heavy, but manageable. I really don't think it's me as the shooter either. I used to shoot 3-postion at the jr olympic level, and I'm also shooting from a solid two sandbag system that takes the hard work out of it. I open to letting anyone else shoot it in Colorado though.
     
  8. kdumph

    kdumph Well-Known Member

    Messages:
    76
    Joined:
    Jul 5, 2013
    What is your max COAL on that gun for the VLD or to the lands I mean? I'm almost a full inch off from your measurements? 3.850 for the OTMs and 3.790 for the SMKs on my rifle.
     
  9. kdumph

    kdumph Well-Known Member

    Messages:
    76
    Joined:
    Jul 5, 2013
    Also have anyone seen big changes between Retumbo and H1000 or RL25?
     
  10. WyoElk2Hunt

    WyoElk2Hunt Well-Known Member

    Messages:
    1,193
    Joined:
    Aug 15, 2009
    My mistake my COAL is 3.800 not 3.080
     
  11. den

    den Well-Known Member

    Messages:
    219
    Joined:
    Nov 25, 2007
    do you have your groups on that target documented to what groups are what ? seating depths, powder charges , bullet ect....
     
  12. kdumph

    kdumph Well-Known Member

    Messages:
    76
    Joined:
    Jul 5, 2013
    I do the photo is all of SMK's, but the bergers had the same performance. The top right group of 6 were a ladder test at 3.950.
    Moving left, 90gr at 3.950 (was the first load I tested when I was working with the bergers and had performed a tad better. So I loaded four.
    Moving down, 89gr 3.979
    Down Again, 89gr 3.974
    Moving left, 89gr 3.969
    Moving down, 89gr 3.958
     

    Attached Files:

  13. den

    den Well-Known Member

    Messages:
    219
    Joined:
    Nov 25, 2007
    IMHO the top three of that ladder look promising to me if that is three different powder charges
     
  14. kdumph

    kdumph Well-Known Member

    Messages:
    76
    Joined:
    Jul 5, 2013
    I want to say, one of those was a called flyer in that top three while shooting the ladder so I didn't pay it much heed.