Retumbo, H1000 Barrel Length???

Discussion in 'Reloading' started by ovastafford, Jan 16, 2010.

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  1. ovastafford

    ovastafford Well-Known Member

    Oct 23, 2009
    Iv just started reloading for my 300RUM and it has a 25.25" barrel. Iv been loading up some Retumbo for it. My question is with a 25.25" barrel will I get the most velocity out it or should I use maybe a little faster burning powder. I know most ultra mags have at least 26" barrels on them so it got me thinking if it would be a better idea to try H1000 or something faster? I dont have a chrony so I dont know my velocity and Iv been loading 210gr bergers and 200 accubonds. Any advice would be appreciated.
  2. MT4XFore

    MT4XFore Well-Known Member

    Oct 20, 2005
    Sounds like you may have a Sako or a Tikka. You need not worry however, 3/4 of an inch will not make a noticable difference. Just find the load that shoots the best and go with it. Good luck and God Bless

    Last edited: Jan 16, 2010
  3. sniper2

    sniper2 Well-Known Member

    Jan 10, 2003
    O the shorter the barrel the faster the powder otherwise you blow some out the barrel...
  4. Joel Russo

    Joel Russo Well-Known Member

    Jul 5, 2006
    Without a chronograph, you're simply guessing at velocity.

    My experience with the .300 RUM and the heavier bullets is that Retumbo will give consistently higher velocity over the others.

    I suggest you do comprehensive load development with a few different powder and bullet combinations to see what the rifle likes, not what you want it to shoot.
  5. Ernie

    Ernie SPONSOR

    Jun 18, 2007
    I also shoot short barrels: 15"-18" with cartridges like 6-284, 7mm Dakota, and 338 Lapua Improved.
    I pretty much use the slower powders myself too, or I will use the next fastest burn rate from teh slowest one typically used in longer barrels:
    Such as, H-4831sc for my 6-284, H-4350 and or Hybrid 100V for my 6.5-284's, H-1000 for my 7mm Mag Imp, Retumbo with my 7mm Dakota, and Retumbo with my 338L Imp.
    All of these have barrel lengths that I have listed above.
    Find what is most accurate for your rig and be happy and as mentioned a chrono will tell you alot.
  6. TheBlackPearl

    TheBlackPearl Member

    Oct 28, 2009
    I just did an experiment that might help you out! I shot the max h1000 load compared to the max retumbo load in the seirra book and the h1000 averaged 2710 and the retumbo averaged 2890. the retumbo wazs definately hotter load, the h1000 could have went a little hotter to match the primer markings on the retumbo!
  7. 41mag

    41mag Well-Known Member

    Feb 7, 2005
    Just a thought,

    My bunting bud, worked up loads with both Retumbo and H-1000. He foud that while the Retumbo did give higher velocities, it also loosened up pockets on the bras faster than the h-1000 did. So you might give that some consideration due to the state of affairs we have in getting components these days.

    If you r happy with getting three to five loads verses the same accuracy and getting 12 - 15 loads per case, then no biggie either way.

    Just some food for thought.