300 WSM Reloading Advice

Discussion in 'Reloading' started by skookum, Jan 26, 2013.

  1. skookum

    skookum Well-Known Member

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    I recently bought a McMillan built 300WSM and have very little time behind it, I dont have all the reloading equipment at this time due to my current housing situation(the army doesn't like it when you have primers and several pounds of gun powder in their housing) but I have done some load testing with factory loads to give me an idea where to start when i am actually able to start reloading myself, hopefully in the near future.

    The rifle shot sub .5 moa at 100 yds with 175gr Sierra Matchking HP loaded by Black Hills Ammuntion. I have yet to try berger bullets, which is on my to do list, but i am more curious about powders and where might be a good place to start, and how much different types of magnum powders may effect accuracy. I appreciate the help.

    -Skookum
     
  2. Stick

    Stick Member

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    Mar 7, 2011
    Mine likes H-4350. I will try to round up some load data.
     

  3. winmag

    winmag Well-Known Member

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    RL-17 is the velocity king in the 300WSM with 180gr class bullets. (Keep it UNDER 66gr!)
    RL-19 is good all round powder, as is Either of the 4350's, & 4831's
    For 200+ gr bullets IMR-7828ssc is a great choice, as is RL-22

    I launch all mine with Nosler brass, Fed.215 primers, & Accubonds, & couldn't be happier.
     
  4. Fire306

    Fire306 Well-Known Member

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    I have just acquired a Sako 75 in 300 WSM, that I too am looking for loads for.
    I have some 180gr Barnes TTSX bullets to try, I would like to stick with the heavier bullet weights as I have lots of caliber choices in the safe for lighter firepower.

    The barrel is 24 3/8" and 1-11 twist. I am hoping I can push the 180's in the 3050-3100fps range.
     
  5. jfseaman

    jfseaman Well-Known Member

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    My load for 300WSM is:

    Win Brass
    60.5gns H4350
    Hornady A-Max 208
    -.010 from lands.
    Fed GM210M primers

    2720fps

    Sub-Moa to 700 yards and waiting to try longer.
     
  6. D.ID

    D.ID Well-Known Member

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    My WSM likes h4350 and berger 190vld.
     
  7. kermodie

    kermodie Active Member

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    Apr 6, 2012
    H4350 with all bullet weights
     
  8. skookum

    skookum Well-Known Member

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    Nov 2, 2011
    Thanks for the info, I guess I'll start with H4350 and go from there. I'm eager to try the Bergers after reading so much about them on here. I would also like to try heavier Barnes X bullets, even though mine did not like the 168 gr TTSX very well, shooting barely under moa at 100yds.
     
  9. frequent misser

    frequent misser Well-Known Member

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    I had good luck with h4350 for bullets up to the 180's. Any heavier and I got much better velocity from h4831 sc. I run 208 amaxs at 2890.
     
  10. skookum

    skookum Well-Known Member

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    Noted. Thanks Frequent Misser, is your rifle a short action? I am worried if i used something much over 180 gr bullets the OAL will be too long to fit in my mag well.
     
  11. MontanaRifleman

    MontanaRifleman Well-Known Member

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    H4350 is a good powder. RL17 beats it by 200 fps in my 300 WSM for 180 bullets and excellent velocity with 210 Bergers.