300 WSM loading help

Discussion in 'Long Range Hunting & Shooting' started by Mossbird8, Dec 5, 2018 at 4:02 PM.

  1. Mossbird8

    Mossbird8 New Member

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    I have a Kimber Montana 8400 300 WSM and is in the works into reloading. I currently have 165gr accubonds and Norma brass. What are your best loading data for that type of bullet for the best accuracy?
     
  2. Doc88

    Doc88 Well-Known Member

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    Around 59gr RL15 worked well for me with a 168 Berger and Norma brass. 3100fps. Should be close with the Accubond. Of course start 2 grains lower and work up.
     
  3. th82457

    th82457 Well-Known Member

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    I have usually got best accuracy with either RL-19 or H4350 with 165 gr bullets.
     
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  4. Dosh

    Dosh Well-Known Member

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    Have had best accuracy with H4350 and 168-185 weight bullets. Quality brass made a great difference for me. Good luck
     
  5. Mossbird8

    Mossbird8 New Member

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    What is your overall length for those loads, and how much powder you usually starting out with? Just need somewhere to start out at. And I’m assuming cci primers.
     
  6. LoneTraveler

    LoneTraveler Well-Known Member

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    I bought one of the first Kimber 300 WSM on the market. Located it in Missouri about 2004.
    I know Melvin Forbes of NULA, He was given credit for the Montana's stock design,
    And his rifles I had shot were accurate and did not kick like many other light rifles.
    I set mine up as a light walking hunt rifle with a Leopold 2.5X8 scope and Nylon Sling.
    I had to get my load off the internet not in loading books in 2004.
    I loaded 150 gr. 165gr. and 180 gr. bullets went to 100 yd. range.
    The 150 gr. shot 1 3/4' 165 gr shot 1 3/8" and the 180 gr. went in 9/16".
    This rifle seems to only like 180 gr. bullets. Sierra, Hornady, and Nosler Part. shoot good in this rifle.
    My first load was, Preped New Win. Brass, Winchester LRM, IMR 4350 65 gr. (Sixty Five.0) and 180 Gr Sierra Bullet. O.A.C,L 2.860.
    Also Loaded Hornady Interlock and Nosler Part/ 180 gr. same load specs.
    The Hornady 180gr. is my deer load.
    The Nosler 180 gr. Partition for big game.
    I have taken Elk, Caribou and Whitetail with these loads.
    The Montana has about everything a person could want in a walking rifle.
    Comp stock, Stainless Action and Barrel, The Action has Mauser claw extractor, Adjustable Sako firing pin and Win. 70 3 position Safety. The bolt is easy to remove the firing pin to clean and lube in bad weather. Good Luck and Happy Hunting.
     
  7. 65WSM

    65WSM Well-Known Member

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    Hornady, as you probably know, developed the "Superformance" ammunition using compressed loads of proprietary ball powers from St Marks in Florida. Hornady says that it blends several different burn rates of that powder and most are not available to the public. The one version that is available is called Superformance that comes from Hornady's 300 WSM ammunition. It goes zoom. Use the Hodgdon data and you will be amazed. I have a hard time keeping up with the .300 RUM, longer barrel 100gr of powder.
     
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  8. JohnnieB

    JohnnieB Well-Known Member

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    I've had several Kimbers in 300 WSM, the common load for accuracy and velocity has been Norma brass, Barnes TTSX 180's at 2950 - 3000, with CCI200 primers and RE17. This load has accounted for more animals and rocks than I can add up.
     
  9. basinman

    basinman Active Member

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    I have had good results with H414, H4350 and Superformance.
     
  10. 11Bugles

    11Bugles Member

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    I liked the Superformance too at 67.4gr. with the Hornady ELD-X
     
  11. 11Bugles

    11Bugles Member

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    Sorry, that was a 178gr ELD-X
     
  12. LDHunter

    LDHunter Well-Known Member

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    I sold my only 300WSM a few years ago and it was a lightweight but I found the recoil from the 180gr bullets to be objectionable but the 165's were the sweet spot anyway in that rifle and Varget was my powder of choice. I remember quite a few groups of 5/8" and less with that rifle and it killed like a lightning bolt. I only shot Nosler bullets in it and it seemed to like the Ballistic Tips, AccuBonds and Partitions equally as well with a slight accuracy edge to the Ballistic Tips.

    Now I am using the kinder and gentler 300SAUM and 7mmSAUM chambered rifles and my shoulder is much happier and the game can't seem to tell the difference. ;)
     
  13. th82457

    th82457 Well-Known Member

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    My Montana preferred the Barnes 168gr TTSX. Extremely accurate.
     
  14. brentc

    brentc Well-Known Member

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    Use 66-67 grains of RL17 with your 165s. You should see around 3200 fps with stellar accuracy.