Vihtavuori powders in 300 RUM

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by jmden, May 12, 2004.

  1. jmden

    jmden Well-Known Member

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    Have folks been collecting data on the 300 RUM using Vihtavuori N170, 24N41, or 20N29? Specifically, I'm looking for data with these powders and the 200g Accubond. Just curious if anyone has played around with them. Thanks.
     
  2. Nighthawk

    Nighthawk Well-Known Member

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    I would try something a little faster with that round. Those powders were made for the .50 BMG and 20mm Vulcan. According to the VV manual N165 and N170 would be a little better.
     
  3. Brent

    Brent Well-Known Member

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    Jon,

    N170 and 24N41 should be good to try, I just haven't got around to it but planned on those too. 20N29 just might be to slow, who knows though.

    I've never seen anyone post on here, or elsewhere that has tried 24N41 yet, usually I hear about N165 and faster stuff and that's about it.
     
  4. jmden

    jmden Well-Known Member

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    Hmmm...N170 and 24N41 was what I was thinking to for the 200g and up. I can get the N170 locally, but have been having difficulty tracking down 24N41. My understanding is the N170 is temp insensitive, but does anyone know about 24N41? Or, is it like H870 in warmer temps?

    Jon
     
  5. Brent

    Brent Well-Known Member

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    Looking at the 300 Lapua data, N170 is 7gr faster than 24N41, and 24N41 is 11gr faster than 20N29.

    Speeds for the 200gr 3.661 OAL:

    N170 - 3025
    24N41 - 3064
    20N29 - 3133

    Speeds for 220gr 3.661 OAL:

    24N41 - 2894
    20N29 - 2992

    It sounds like any of them would be a good choice.

    24N41 and 20N29 - Grain size is 2.3mm x 1.3mm, single base surface treated, like the N100 series powders. I doubt it's temp sensitive either.
     
  6. jmden

    jmden Well-Known Member

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    Yeah, I've seen that data, and if you look at the VV data for the 30-378 Wby, it is exactly the same as for the 300 Lapua Magnum. Is this a misprint? I find it hard to believe that those two cartridges could have exactly the same numbers for powder amounts, bullet weights and velocities across the board. They even mention different length barrels and twist rates...so I do not have a high degree of confidence in the numbers because I'm not sure which gun they are for.

    Jon
     
  7. Perkules

    Perkules Well-Known Member

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    Hello,

    at least in the latest manual the 300 LM and 30-378 data are not the same. They even list different powders for 200 grain bullets, for example.

    .http://www.lapua.com/Reloading%20guide%20for%20centerfire%20cartridges%201 -2004%20versio%2024.3.pdf

    I have used both N 165 and N560 in 338 LM, N560 gives lower pressure at a given velocity. I would try N560 in 300 RUM although I have no first hand experience on N560 temperature sensitivity yet. But it shouldn´t be bad.

    [ 05-16-2004: Message edited by: Petander ]
     
  8. jmden

    jmden Well-Known Member

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    Petander, Thank you for bringing this to my attention. I had printed out VV's on-line reloading information last fall and that is the one that had the same data for 30-378 Wby and the 300 Lapua Mag. VV now has new (1/2004) reloading information. My mistake. Sorry guys.

    Jon Denham
     
  9. jmden

    jmden Well-Known Member

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    Petander,

    Are VV N100 powders temp insensitive as the Hodgdon extreme powders are supposed to be? I thought that they were and now I am reading some information that suggests they are not. Does anyone know?

    Thank you,

    Jon Denham
     
  10. shilen30

    shilen30 Well-Known Member

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    For the life of me I can't remember where I read it, but I read that it was the 500 series that wat temp insensitive like Hodgdon.
     
  11. Perkules

    Perkules Well-Known Member

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    Jon,

    I´ll do some freezer tests to find out about it.
     
  12. Perkules

    Perkules Well-Known Member

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    I also posted the question in a brand new finnish sniper board, we will have answers sooner or later.