Which powder to start with

Discussion in '7mm STW' started by newstwshooter, Oct 6, 2013.

  1. newstwshooter

    newstwshooter Member

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    I got a STW built a couple months ago and have shot 3 boxes of Nosler factory ammo through for the brass. I would like to start reloading for it and would like to start with 160gr Nosler Accubonds. Any recommendations on which powder to start with to start working up a load ? Any help would be greatly appreciated.
     
  2. gamehawker

    gamehawker Well-Known Member

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    Hodgdon H1000 or Hodgdon Retumbo.
     

  3. muliehunter

    muliehunter Well-Known Member

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    I use hodgon us 869 in mine and rem mag primers at 91 grnwith 160 acubonds
     
  4. Anvil11-87

    Anvil11-87 Well-Known Member

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    I've had really good luck with H1000.
     
  5. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    rl22,rl25 for mid weight.... rl33,rl50 for heavies.... retumbo, h1000, and h50bmg if you like to srpinkle a bit of single base around. 7828 will work for mid weight too but the pressures tend to be up a bit by the time to get to good speed.
    Ball type slow burners can work well too but some bores (like mine) won't eat them well; it's hit and miss with those in this cal and the temp sensativity makes non stabilized stick powders look good.
     
  6. Kaboom

    Kaboom Well-Known Member

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    I use Viht 165 with 140 Nosler BT's a real tack driver!
     
  7. supercrossbmx69

    supercrossbmx69 Well-Known Member

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    Lefty7mmstw, I was lucky enough to find some 180gr Bergers so where should I start to work up my loads with Rl50 and rl33? I've already Burnt through all my h1000 and retumbo trying to figure out my chrony problem (returned that pos)
     
  8. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    With the 171 barnes match last year I was at 86 grains rl50 at 3100 fps in a 24" bbl. with normal pressure. I worked up a load with rl33 and the 171 but rl33 was rather stiff by 84 grains. I've actually gone to either the 140 accubond with 82.0 rl25 under it or the 150 ablr with 80.0 rl25 under it at present. My rifle has a 10" twist and is flaky with accuracy at that bullet weight; one day it's 1/4 moa, the next it's 2 moa. Here's alliant's poop sheet for rl33 from last year.

    [​IMG]
     
  9. gunsmith2

    gunsmith2 Member

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    7828 with 160gr works greatgun)
     
  10. newstwshooter

    newstwshooter Member

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    IMR 7828 does work great ! It's the first powder that I tried and after a bit of playing around I got a 0.560" group. I'm still trying to find some H1000. Powder is really hard to come by up here in Alberta.
     
  11. NeLab1

    NeLab1 Member

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    Don't over looked H4831 SC I have had great luck with it in all bullet weights from 140-160 in two 700 both guns will shoot one hole groups.
     
  12. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    more like 2950 or so at that charge with a good bit of room to go; sorry about the errant ## on speed.. The top speed I had with rl25 was at 3100 fps..
     
  13. Cornfield Flats

    Cornfield Flats Active Member

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    7828 SSC or RL-25 in both of mine.
     
  14. 7stwluvr

    7stwluvr Member

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    May 23, 2012
    In my custom abolt this is my go to powder. Not the fastest load but scary accurate with 140gr barnes ttsx bullets ! I have great luck with 7828 ssc and have a good 160 gr load with h1000 also. But my accumark loves the 7828 ssc still working on the couple 8lb jugs of each I have.