300 ultra mag load data

Discussion in 'Reloading' started by billywj, May 14, 2008.

  1. billywj

    billywj Member

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    Apr 23, 2007
    I am havin a hard time finding a load that my gun likes.
    I have tried six different loads with H1000 and Reloader 25
    with a Hornady SST.
    has anyone shot this bullet

    i also got some berger VLD 185g but they say to start them at the rifling
    but there is a problem the mag box is not long enough to do so.


    What would be a good starting load with the berger any info would help

    THANKS BILLY
     
  2. mattj

    mattj Well-Known Member

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    Jun 27, 2007
    Billy,

    Drop Walt Berger an email at BERGERLTD@aol.com with the cartridge you want to load for (.300 RUM) and the bullet you'd like to use (185gr VLD), and he will send you load data :)
     

  3. billywj

    billywj Member

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    Apr 23, 2007
    thanks matt i send him a email
    have you shot any of the berger bullets
    if so how well did they preform
    i got some 52g match for my 22-250
    and cant get them to fly
     
  4. mattj

    mattj Well-Known Member

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    Billy,

    Sorry to say I haven't shot them yet (my long-range .300 Ultra build that got me researching VLD bullets is still making it's way piece by piece to .308 Nate).

    From what I've read though, the stuff about seating them at or into the lands is no BS... If you really want to shoot the Bergers, you probably will just want to give up on the mag and work your rifle as a single-shot so that you can seat at the depth they like -- or have the rifle modified with a mag that will accommodate the seating depth you need.
     
  5. mrultramag

    mrultramag Well-Known Member

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    Jun 9, 2005
    billywj,
    When I first bought my 300 rum, a bdl, I played with the 180 SSt and RL 25. I got very good groups at 96 gr, rem brass, fed 215, OAl 3.600 When I shot very slowly letting the bbl cool after each shot, I shot as well as .25" 3 shot group at 100 yd. That said; this load was a little on the hot side for my tastes as I was getting speeds of 3390-3410. I didn't believe the SST was a tough enough bullet for my style of hunting so I pretty much abandoned the load. When I did work it up; it was in the hot summer months however so I doubt it would have shot so fast come Oct or Nov.
     
  6. billywj

    billywj Member

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    Apr 23, 2007
    Well i dropped my gun off to the gunsmith to have a little more work done and he told me that
    there is a company that makes a longer mag box but you have to a bit of work to get it to fit.
    he said he would find out how good they work and let me no if it would be worth doing or not.

    but thanks for the info guys
     
  7. stxhunter

    stxhunter Well-Known Member

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    Aug 15, 2006
    i'm haveing a wyatts mag installed in my 300 rum right now you might try the 200 ab behind 95 gr retumbo its really accurate in my rifle and is the go to load for alot of rum shooters on this forum will get between 3100 and 3200 fts
     
  8. jmden

    jmden Well-Known Member

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    Yeah guys,

    Install the Wyatts box. 4" OAL and controlled centerfeed. Much better than the stock unit in terms of allowed OAL and the controlled cenerfeed is much more reliable. But only 2 down instead of 3--who needs those anyway? :) Have to play with the wings a bit. I've found for my RUM, the 240 SMK likes being right on the lands as well. Have fun tinkering...
     
  9. jwp475

    jwp475 Well-Known Member

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    95 grains of Retumbo behind the 200 AccuBond is an excellent load..
     
  10. billywj

    billywj Member

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    Talked to the gun smith he is going to get me a mag box extender.
    thanks for all your help

    I'll let you no how it all turns out

    Thanks again guys
     
  11. hodgehodge

    hodgehodge Active Member

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    Apr 30, 2008
    stxhunter, ive herd thats a good load and im hoping to try it soon, but do you know if retumbo is temp sensitive ??
     
  12. stxhunter

    stxhunter Well-Known Member

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    i chrono my loads in august it was around 95 dg and they where running 3160 fps av. i haven't chrono them in the cooler months yet but have not notice a change in impact shooting in the winter. but heck it can be 80 dg here in south tx in dec or jan we might only get aweek or so of really cold weather below 40 all winter. but from what i've read on this site is that it is pretty stable
     
  13. hodgehodge

    hodgehodge Active Member

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    just wondering about that cause where i shoot it can be around 0 or colder and i wanted to know if the powder was going to be relieable or not
     
  14. liv4thehunt

    liv4thehunt Active Member

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    Feb 26, 2012
    Your best money spent is on a wyatts extended box. Get the 4inch box the 3.850 will work but as you shoot your gun the throat will continue to grow beyond 3.850 and you will be chasing accuracy again. I had it done to my 300 ultra, groups went below one inch. I then had it glass beaded and it will shoot half inch groups all day.