300 Weatherby Using Hogdon US 869

Discussion in 'Long Range Hunting & Shooting' started by lgloutfitters, Oct 17, 2018.

  1. lgloutfitters

    lgloutfitters Active Member

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    anyone using US 869 in their 300 Weatherby loads?

    I use it in the 6.5-300, with great results. I would think being is they are the same case, that it would work with the 300.

    If anyone one has a PET load that they like please feel free to post as well
    thanks
     
  2. 4xforfun

    4xforfun Well-Known Member

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    I have a gaggle of 300 WBY's and tubes......hunting and Match. Also did lots of load development for other 300WBY's. Every one but one loves RL 25 with the 210 - 230 weight bullet. The odd one liked Retumbo.

    Good luck,
    Tod
     
  3. sable tireur

    sable tireur Well-Known Member

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    Hodgdon doesn't even list it as a powder choice on their reloading website. Examining the characteristics of this powder, it's too bulky and slow to have any reasonable application in the .300 Weatherby. You need a powder such as the Re-25 suggested above or check some of the reloading websites to generate a list of suitable powders.
     
  4. 4xforfun

    4xforfun Well-Known Member

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    What weight bullet are you thinking about? With the 180 class bullet I used to use RL 22, H1000, and ImR 7828. Now they have a BUNCH of new powders out, so, the sky is the limit.
     
  5. lgloutfitters

    lgloutfitters Active Member

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    The 6.5-300 Weatherby is listed on Hogdon’s website with load data for it with US 869. This powder works well in my 6.5-300 (3550-3600) with 143 grain bullets, 1/2” MOA.

    So, what I don’t understand, is if the 6.5-300 is the 300 case just necked down, why isn’t there load data for US 869 with the 300 Weatherby?
     
  6. MudRunner2005

    MudRunner2005 Well-Known Member

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    IMR 7977 is another great option for the .300 Wby size/capacity cartridges.
     
  7. WildRose

    WildRose Well-Known Member

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    RL26, 33 or H1000. US 869 is too slow, Retumbo way too dirty for me.
     
  8. sable tireur

    sable tireur Well-Known Member

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    Simple fluid dynamics (or plasma dynamics in this situation), take your garden hose and open the sprayer all the way up. The stream of water is slow and low pressure at full volume. Now turn the sprayer all the way down to the smallest orifice and the pressure surges up and the stream has more force.

    There is a general rule of thumb which gets applied to reloading. The smaller the caliber in a cartridge case, the slower the powder necessary to achieve proper pressure. The larger the caliber in a cartridge the faster the powder can be to achieve the pressure.

    In essence, your 6.5-300 Weatherby functions at pressure with a slightly slower powder and your .300 Weatherby uses powder a step or two faster than that pressure range.
     
    WildRose likes this.
  9. lgloutfitters

    lgloutfitters Active Member

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    Thank you sir. Good stuff right there
     
  10. lgloutfitters

    lgloutfitters Active Member

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    But on my US 869 canister, it offers load data for a 30-378. Is that because it is necked down?
     
  11. sable tireur

    sable tireur Well-Known Member

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    The easy explanation is case capacity.

    .300 Weatherby Magnum = 99 grains of H2O (approx)

    .30-378 Weatherby = 133 grains of H2O (approx)

    You can stuff a lot more powder in the .30-378 case than you can in the .300 case.

    Regards.
     
  12. Varminator 911

    Varminator 911 Well-Known Member

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    The 30-378 and 6.5-300 both have larger case capacity to bore ratio than the 300 weatherby. It's the case capacity to bore ratio that determines the speed of powder that works best. The 30-378 and 6.5-300 are both way over bore capacity. The 300 less so.

    If you neck the 378 down to 6.5 you'll need an even slower powder than any of the above. If you were to neck the 300 up to 375 you'd need a faster powder than any above.
     
    CliffM likes this.
  13. WildRose

    WildRose Well-Known Member

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    It's a monster sized case necked down to .30 cal similar to the Rum and Lapua.
     
  14. WildRose

    WildRose Well-Known Member

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    And if you stuff equal amounts of the wrong powder in the big case it goes boom!