7 mm STW Loads

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Blacktail, Aug 10, 2006.

  1. Blacktail

    Blacktail Well-Known Member

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    Thanks to all who posted some loads last time. I'm finally getting my equipment in the mail. Do have a question some of you guys were loading over 80 grains for the 140's. Looking at the books and couldnt find any loads that high. The guy who built my rifle also worked up a load with 140 accubonds, IMR 4831 with 74.5 gr and claims it was holding between .5 and .75. Havent shot them yet was saving them for killing until i could start loading. Would love to keep that kind of accuracy but get it up around 3400 to 3500 Any thoughts
     
  2. remingtonman_25_06

    remingtonman_25_06 Well-Known Member

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    IF you have a cronograph, you can work up in .5g or 1g increments to that velocity, if its safe in your rifle, and work around there. Cronographs are a great piece of equipment. Dont pay much attention to books, there just a reference guide.
     

  3. Ridge Runner

    Ridge Runner Well-Known Member

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    my load of 86 gr of H-1000 behind the 140 will shoot under 1/2" about every time for a 3 shot group have a couple in the .2's. it runs 3550 fps out of a 1/9 #5 lilja 28" long.
    only pressure sign I get is a slightly flattened primer (but was told by a ballistic tech at sierra that this is normal with fed. primers due to the soft cup) I can use up to 88 gr if I have fireformed brass that run just over 3600 fps with slightly flattened primers but its just not needed.
    Hodgdon #27 calls for a starting load of 81 and max of 85.5 of H-1000 for a 139 gr.AA's load for 8700 runs from 84.6 to 94 gr.
    JS
     
  4. Blacktail

    Blacktail Well-Known Member

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    Anyone try the IMR 4831 or H4831 or H4831sc and run it up to 80+ grains. Speaking of chronos got a 'Pro Chrono' from a buddy but he lost the wings that set up on top where can i get replacements..plus i think it needs some looking at..thnx
     
  5. budlight

    budlight Well-Known Member

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    IMO - Speed is good for varminting. I don't use my 7stw wildcat for varminting. I used to only shoot 175 spbt's Now i also use the "Wildcat 200 VLD's"

    I have never had an elk stop the 175's at out to 400 yards. I would guess that at close range a 140 would really tear up a small deer.
     
  6. dakor

    dakor Well-Known Member

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    I used 140 Accubonds for two seasons and also 160 Accubonds. My load for the 140's was 86grains of H-1000. I was getting around 3426fps. The 140 Accubonds hold together very well even up close on deer. My load for the 160's was 82grains of H-1000 and I was getting around 3256fps. This was out of a Remington Sendero. I liked both bullets but for some reason when the ranges got over 400 yards the 140's shot way better so I mostly used those. I would stick with powders like R-22, Imr-7828, H-1000 or slower yet in the STW. You will find you will get better accuracy with the slower powders.
     
  7. Ridge Runner

    Ridge Runner Well-Known Member

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    94 gr of WC 872 nets around 3325 fps with the 160 accubonds but watch it in hot weather
    JS
     
  8. .30-378

    .30-378 Active Member

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    H4831SC - 81.5
    Nosler Ballistic Tip - 140
    Winchester magnum primer
    TTL - 2.84
    MOAL - 3.575
    100-600 trajectory 2.5/3.25/.25/-7/-19/-36

    This is what I use in the guns listed below: I get 3510 and 3525 FPS respectively. Came up with data before there was published data and it works. Good luck.
     
  9. Oleman

    Oleman New Member

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    4831 is just to fast a powder for 140's you should be using H1000 and with 160 try some H5010 if you can find it. My 140 are reaching 3500 from a 26" Douglas barrel and my 160's near 3400.
     
  10. topwater225

    topwater225 Well-Known Member

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    Curious....why do you say that 4831 is too fast for 140's? So far my STW shoots the best group using H4831 and 140 Accubond. I may be wrong, but I even think Nosler's reloading guide showed H4831 as their most accurate load for the 140's. I changed from 80 gr of RL22 with 150 Scirocco's to 75gr H4831 and 140 Accubonds. The later tightened up my groups enough for me to get really excited about the load. I am going to chrono the load next week and work on maybe bumping up the charge a little.
     
  11. .30-378

    .30-378 Active Member

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    Oleman - why is H4831 wrong? I am using a factory tube on the Laredo and a factory barrel rechambered on the sporter and I am matching your speeds with a 140 grain pill. Let me know.

    Things that make you go Hmmmm....
     
  12. Ridge Runner

    Ridge Runner Well-Known Member

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    budlight, the 140's aren't very destructive on deer, from 300-500 yds they hold togather very well, at 90 yds they aren't any worse out of a stw than they are from any other .284 dia. rifle, besides the 140's shoot flatter to 600 yds than the 160's out of the big 7
    JS
     
  13. Blacktail

    Blacktail Well-Known Member

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    Let me know what you end up with fps wise..Going to start a batch next week. Been way too busy hunting lately..by the way been slow..Did get to finish off a potential BC blacktail for a buddy at 280 yds due to him only hittin the buck in the knee..And guess what ..its his first deer ever.. /ubbthreads/images/graemlins/smirk.gif
     
  14. sbuckelew

    sbuckelew Member

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    7X300Wby 89.0 H5010 160 Nos part.... 3380 fps shoots between .3 and .48 anyday of the week... /ubbthreads/images/graemlins/blush.gif