6x47 Lapua and H4831SC

Discussion in '6mm, 6.5mm, and .25 Cal (Not 6BR)' started by CAPTHOOK58, Aug 3, 2019.

  1. CAPTHOOK58

    CAPTHOOK58

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    Has anyone tried H4831SC with a 105gr bullet in a 1-8 twist barrel?
     
  2. dstoenner

    dstoenner Silver $$ Contributor

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    Yes. I am running 40.2 with 105 Berger Hybrids. Just did a ladder from 39 to 42.0 in .5 steps. From 39.5 to 41.0 the groups were in the 4’s and 3’s. Since this is a practice load I went on the lower end.

    David
     
    Last edited: Aug 4, 2019
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  3. Bill Bowers

    Bill Bowers Silver $$ Contributor

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    Did you happen to get a velocity on the H4831SC?
     
  4. RonS

    RonS

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    David, what discipline are you using your 6x47 for? I'm hoping to push mine out to 1K. I'm still in the process of building mine. I tried filling a case to see how much powder I can get in it up to body/shoulder junction. I was able to get 42.0gr to that point, with my bullet seated at the lands this puts the base about half way in the shoulder. Have you gotten any velocity readings yet? I'd like to achieve close to 3000 fps if possible. I'm looking at getting a 1-7 twist barrel to try the SMK 110gr bullets.

    Ron
     
  5. dstoenner

    dstoenner Silver $$ Contributor

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    IIRC is was a little over 2900. My 105 Berger with h4350 at 39.0 is 2990

    HTH

    David
     
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  6. dstoenner

    dstoenner Silver $$ Contributor

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    Ron

    This is my f-class’s gun. It was new to me this year. I campaigned the last 5 years with 260 Remington. At 70 it was starting to wear me down so I have moved to the 6x47. With 115 dtac’s it shoots inside the Berger 140 hybrid in what I was doing with the 260. I wish I could say it works great at 1000 but we have been rained out of 3 matches this year and the last match it was in the high 90’s with the misery index in the low 100’s. I am too old for that. I can say the only match I have shot was a 3x600. It shot well for me

    My barrel is a 30 inch medium Palma 1:7 McGowen Remage.

    As I said in the previous post, my go to powder is H4350. I am running 105 ‘s at 2990 and 115 dtac’s at 2950. There are probably higher nodes but these nodes are better than my 260 with 140 hybrids.

    David
     
  7. dstoenner

    dstoenner Silver $$ Contributor

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    Ok my memory isn’t what it used to be. The 40.2 loaded to 2.660 (about .020 off the lands) is 2775. As isaid before this load is only for 100 yards. I have 3 lbs of h4831sc to use up that i had bought about 5 years ago that didn’t work in my 260. H4350 gives a lot more velocity with same accuracy. Win-win.

    David
     
  8. 1badgoat

    1badgoat Gold $$ Contributor

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    Ron,

    I have achieved +3000 fps pushing Berger 115gn VLD's on top of 38.7gn of RL-16 (3038fps) and 38.3gn of H4350 (3022fps).

    The H4350 showed cratered primers and a heavy bolt lift at 38.9gn.

    The RL-16 doesn't show any signs of pressure.

    The SMK 110gns didn't shoot well for me. YMMV.

    Krieger 26", 1-7 twist, 4 groove, PRS style rifle
     
    Last edited: Aug 4, 2019
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  9. Patton243

    Patton243 Silver $$ Contributor

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    From my understanding, you could have inconsistent ignitions with the slower burning powder and small primers. That's what I read anyway. You may want to look at your SD when you're developing a load with that powder. I have a 6x47 and I use R-16 now. As the guy above said it's less pressure than H4350 and seems to be more temp insensitive too. H4831 for me in other calibers always gave slow velocities too.
     
    Last edited: Aug 4, 2019
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  10. brxlefty

    brxlefty

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    Been shooting this case some 12,13, 14 years using H4350 but with Reloader 16 and the new Hornaday 110 A-Tip bullet will shoot out of a 1-8 twist 30" barrel! In testing at 3331ft at 50 degrees shot a 1.164" group at 600yds! In a match it shot a 1.619" in unfavorable conditions! A 1.619" is nothing to brag about but with more testing it could open EYES! Reloader 16 (40.6gr) 3147 FPS
     
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  11. RonS

    RonS

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    1badgoat, thanks, I'll keep that info in mind when I start my development. It's been so hot and humid here and at my age, that combination makes for miserable shooting.
    Patton243, thanks, I did not know small primers and slow powders don't always mix well.
    brxlefty, Hornady 110gr A-tip...which 6mm bullet and weight do you'll think would work best in a 26" 1-7T barrel out to and maybe pass 1K?

    Ron
     
  12. dstoenner

    dstoenner Silver $$ Contributor

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    With respect to primers in 6X47 Lapua. I loaded up some of my fireform cases (back when I was starting with the 6x47) using BR-4s and CFE-223. Well I had blown primers and severely cratered ones that didn't blow. I stopped and torn all the unfired cases down, changed to 450 primers and all was well. I still had my firing pin bushed because it was an old standard 700 bolt.

    Now all my loads are just fine. In fact I have never found the top end of the 105 hybrid or 115 dtacs. I have always found a node that was below any max I fired. In the case of both the 105 and 115 I took both up to 40.0 H4350 with no signs of pressure. All well behaved. My load for 105 is 39.0 and for 115 39.2 H4350 with CCI-450 primers.

    The funny thing is I have been shooting 6BR for about 10 years using BR-4's with great success but my powder has always been Varget or 8208, both faster burning than H4350.

    David
     
  13. dstoenner

    dstoenner Silver $$ Contributor

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    That is very encouraging for the A-Tips. I may have to break down and buy a box just to see. Then I will at least have a model to gaze at and dream :)

    thanks for the info

    David
     
  14. Stepsjframe

    Stepsjframe

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    anybody use H4831sc and the 105 class bullets in a 243? I'm using Retumbo and seeing pretty decent results, but I'm just not liking how much compression I see with it. H4831sc seemed like it'd provide a nice case fill...
     
  15. Farmerboy78

    Farmerboy78 Silver $$ Contributor

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    Try h1000 in the 243
     
  16. steve123

    steve123

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    If you throat to a longer OACL then H4831SC is a great choice for 6x47L. My reamer has a long .208" freebore. My old load was 43.1 grains for 3172 fps in a 28" barrel with 105 hybrids. Even with my long freebore this load was slightly compressed but pressure signs were normal and I have 38 cycles on my 12 year old brass.

    I used this same powder with 115DTACS about 8 years ago but I can't remember what charge weight I used back then. When the barrel was new-ish I was at 3000 fps.
     
  17. brxlefty

    brxlefty

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    Try 115 dtac and H4350 or Reloader 16 about 40gr! A friend has had great luck with dtac and v-150! Just stay with cci450!
     
  18. DirtySteve

    DirtySteve Gold $$ Contributor

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    I just shot a ladder test yesterday. 105 HVLD and H4831SC 41.4 to 42 grains shot really close. Need to reshoot a finer ladder in better wind. Wind was horrible. No idea on the velocity.
     
  19. Eloudamy

    Eloudamy Site $$ Sponsor

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    I have had some experience with this caliber. I’ve had good luck with a Savage wearing a 1:8 twist.
    I just got a Stiller in 6x47 with a Brux 1:7.5, 29” long.
    I really liked the 110 SMK on paper and last weekend I took all my loading equipment to the range and tuned a pretty descent load with it.
    I was able to get to 3120 with RL16 and that was my most accurate powder.
    I can shoot smaller groups at 200 with the BERGER 105 but at 600 and 750, this bullet was great.
    I backed off the 3120 load and find one at 3030 that’s accurate and with moderate pressure.
     
    Last edited: Aug 11, 2019
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  20. Eloudamy

    Eloudamy Site $$ Sponsor

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    It seems to me that the 7.5 twist was quite sufficient for the speed and distance I was shooting. I’m not sure if it would stabilize in a smaller cartridge but I was pleased with this bullet in this caliber. I’ll update on 1000 yard shooting when I can.
     
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