300 win mag load

Discussion in 'Reloading' started by Big Smitty, Apr 19, 2014.

  1. Big Smitty

    Big Smitty Member

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    I am building a 300 win mag right now and I'm looking for a good load for it. I am going to use 200 grain Accubonds and I'm looking to get over 3000 fps SAFELY if possible. I have RL19, RL25 and IMR 7828ssc on hand. If anybody has a good starting loads I'd appreciate it. As always I'll reduce the load and work up to a max load for safety's sake. Thanks!!
     
  2. carnyman

    carnyman Well-Known Member

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    I'm workink right now with H4831 and had great results at 69gr but at less than 2700fps. I'm working up and found another good group at 73gr. No presure at all yet. Can't wait to hear your results.
     
  3. Truc

    Truc Well-Known Member

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    I have 7828, I first tried Retumbo in my 300 Win Mag w/ the 210 Bergers and it worked so well that I haven't tried anything else. I only have 1 lb of the Retumbo so I may be trying the IMR 7828 since I have 4 lbs of it.
     
  4. carnyman

    carnyman Well-Known Member

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    I tried th 7828 with the 210gr Bergers and my rifle wasnt happy with it. I just got some Retumbo and ill try that next.
     
  5. Truc

    Truc Well-Known Member

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    I'm at 75.5gr Retumbo w/ 210 Berger, after seeing your results w/ 7828 maybe I'll try Reloader 25
     
  6. Big Smitty

    Big Smitty Member

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    Thanks for the responses. Still waiting on my barrel. I am going to load some work up loads in the 7828 ssc and the RL25. I'll let you guys know how it goes.
     
  7. kcebcj

    kcebcj Well-Known Member

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    I'm in the same boat you are waiting on a new barrel that will finish at 27" In QuickLoad have been playing with IMR 7828, RL25, and RL19 and H1000. 7828 and RL19 do not get a full burn in a 27 inch barrel but they are at about 99.85%. RL 25 burns out at about 17 inches. This is for the 210gr Berger.

    I don't think you can get the 3000fps safely with the 210gr Berger. 2900 is much more reasonable and then the pressure for the above powders is around 58,500psi with a max of 62,366psi with a COAL of 3.340. All rifles are different and QuickLoad is just a guide so........

    I want to use the 215gr Berger with a starting COAL of 3.600. QuickLoad says I can get to about 2800fps safely with 69gr IMR7828 and the 27 inch barrel...will see when I start banging away. Good luck with your search.
     
  8. Big Smitty

    Big Smitty Member

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    Kcebce
    I like the long barrel but I am looking to go shorter on the 2 projects I have going now. I am going with a 24" Shilen on a 30-06 and a 24" Criterion on a 300 Win Mag. 1st time trying the Criterion.

    Can you run QL with a 24" barrel and a 200 grain Accubond please. I'm most interested in the 7828ssc and the RL25.

    I'm also setting up a 30-06 with a 24" barrel using 180 grain hornady interbonds looking to use the RL19 on this rig.

    We'll have to compare notes as we go along. Thanks.
     
  9. kcebcj

    kcebcj Well-Known Member

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    With both 7828 and RL25 you will max out around 2850fps rifle dependent of course with a 24 inch barrel 200gr Accubond 300 WM and a COAL of 3.340.

    You should also give RL17 a try in the 06. I use 53gr RL17 with 190gr Berger, 2706fps quite accurate. You can go hotter but 53gr came out the best. This was with a 26 inch barrel and a COAL of 3.345.....070 off.
     
  10. Timber338

    Timber338 Well-Known Member

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    My 300 wm 26" barrel shoots the 210 berger with 75.8 grains of RL25 accurately with no pressure signs around 2915 fps. My barrel likes .085" jump so my COAL is only around 3.460" (from memory, which sometimes if a bit fuzzy). The funny thing with my barrel is it does NOT like a small velocity window between 2860 and 2890. Throws the bullets about 3/4" low. 74.0 grains has an average velocity of 2835 and shoots sub 3/8 moa. Even though it shoots pretty good above 2900, I'm going to hunt with the 2835 load.

    I did reach 3000+ fps with the 210 Bergers and 78 grains of H1000, cratered primers and sticky bolt. woops... won't do that again.

    I have shot the 200 Accubonds, but I did not reach 3000. Just like the 210 I probably could have gotten there with overpressure and no accuracy. I did not do much development with the 200 accubonds, but the most accurate loads were somewhere in the low 2900's with H1000.
     
  11. Big Smitty

    Big Smitty Member

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    Thanks for the additional info. I just completed the 30-06 build tonight. Stevens 200 donor with a 30-06 shilen heavy sporter stainless 24" barrel, barrel and action ceracoated, Bell and Carlson Medalist stock, Rifle Basix Sav-1 trigger, EGW picatinny rail and VX-III scope.

    Starting to work up loads this week. I have RL19 and will use this with the Hornady 180 grain interbonds. First need to work on initial COAL and setoff the lands. Will start with LR primers and 62 grains of RL19 and work up. Hoping to get to 2800 fps or maybe a little more.
     
  12. kcebcj

    kcebcj Well-Known Member

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    62 grains is way too hot for RL19 and 180gr for a 30-06. You must have meant 52gr's right?
     
  13. Big Smitty

    Big Smitty Member

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    Yes you are correct. That would be no bueno!