200 gr accubound retumbo 300 rum

Discussion in 'Reloading' started by stxhunter, May 13, 2007.

  1. stxhunter

    stxhunter Well-Known Member

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    finally got to load some rounds for my 300 ultra i started at 90 gr and work up to 95 in 1/2 gr increments shooting 5 shoot groups at 100yds 55 rounds total shoulders a little sore. Best group was at 94gr and 95gr with 95 giving me the best at a little under 3/4moa i'm sure someone with better from would close it up more. I'm pretty sure this is close to max if not allready there primers starting to flow a little and extracter marks can someone run this on quick load and see what the velocity might be . I'm shooting a 700p 26 inch barrel rem brass fed gm 215 primmers and retumbo at 94 gr and 95 gr temp was 84 today and i'm about 10ft above sealevel if that info is helpfull thanks in advsnce stxhunter
     

  2. wildcat

    wildcat Well-Known Member

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    I would say your velocity is around 3150 to 3200fps.
     

  3. Takman

    Takman Well-Known Member

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    Mar 29, 2006
    Using 95 Grs. with the Fed 215 at 700 ft above sea level and 50 degrees in a 26 inch barrel I averaged 3225 with a 8 ES. Hope this helps.
     
  4. TCampbell

    TCampbell Active Member

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    Jan 6, 2007
    I am shooting 94 gr of retumbo.

    Rem Sendero 26in tube.

    4000 ft elevation.

    3075fps average.

    1/2in groups at 100.
     
  5. stxhunter

    stxhunter Well-Known Member

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    thanks guys i know one thing i won't ever shoot 55 rounds off the bench like that again my shoulder feels like its broke today
     
  6. POP

    POP Well-Known Member

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    [ QUOTE ]
    finally got to load some rounds for my 300 ultra i started at 90 gr and work up to 95 in 1/2 gr increments shooting 5 shoot groups at 100yds 55 rounds total shoulders a little sore. Best group was at 94gr and 95gr with 95 giving me the best at a little under 3/4moa i'm sure someone with better from would close it up more. I'm pretty sure this is close to max if not allready there primers starting to flow a little and extracter marks can someone run this on quick load and see what the velocity might be . I'm shooting a 700p 26 inch barrel rem brass fed gm 215 primmers and retumbo at 94 gr and 95 gr temp was 84 today and i'm about 10ft above sealevel if that info is helpfull thanks in advsnce stxhunter

    [/ QUOTE ]

    what is your COAL? I can run quickload for you. The 300 rum with 200 gr 'should" max out around 3150 under sane pressures.
     
  7. stxhunter

    stxhunter Well-Known Member

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    it was 3.72 this is the longest that would fit the mag
     
  8. hoghound

    hoghound Well-Known Member

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    Dec 7, 2005
    Stay with the 94gr. charge with Retumbo. If you press it past that you will open the primer pockets pretty quick and have to chunk the brass.

    At 94gr. of Retumbo, the 210Vld was 3100 out of my Sendaro. The 200 Nosler was 3263,3267,3261 dirty barrel and 3190,3196,3197 with clean barrel using 91.5 of RL-25. Keep in mind that the RL-25 is very very temp sensitive down here where we are.

    Tim
     
  9. POP

    POP Well-Known Member

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    Cartridge : .300 Rem Ultra Mag
    Bullet : .308, 200, NOS AccuBond 54618
    Cartridge O.A.L. L6: 3.720 inch or 94.49 mm
    Barrel Length : 26.0 inch or 660.4 mm
    Powder : Hodgdon Retumbo

    Predicted data by increasing and decreasing the given charge,
    incremented in steps of 2.0% of nominal charge.
    CAUTION: Figures exceed maximum and minimum recommended loads !

    Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
    % % Grains fps ft.lbs psi psi % ms

    -20.0 80 75.20 2520 2821 31981 11646 99.4 1.729
    -18.0 82 77.08 2582 2961 34231 11871 99.8 1.684
    -16.0 84 78.96 2643 3102 36641 12060 100.0 1.640
    -14.0 86 80.84 2703 3245 39229 12217 100.0 1.589
    -12.0 88 82.72 2763 3389 42005 12366 100.0 1.539
    -10.0 90 84.60 2821 3534 44987 12512 100.0 1.490
    -08.0 92 86.48 2879 3681 48192 12655 100.0 1.444
    -06.0 94 88.36 2936 3828 51637 12795 100.0 1.399
    -04.0 96 90.24 2993 3977 55312 12930 100.0 1.356 ! Near Maximum !
    -02.0 98 92.12 3049 4128 59220 13062 100.0 1.316 ! Near Maximum !
    +00.0 100 94.00 3104 4280 63392 13190 100.0 1.276 ! Near Maximum !
    +02.0 102 95.88 3160 4433 67848 13314 100.0 1.238 !DANGEROUS LOAD-DO NOT USE!
    +04.0 104 97.76 3214 4588 72611 13433 100.0 1.202 !DANGEROUS LOAD-DO NOT USE!
    +06.0 106 99.64 3269 4745 77707 13548 100.0 1.167 !DANGEROUS LOAD-DO NOT USE!
    +08.0 108 101.52 3323 4904 83164 13659 100.0 1.133 !DANGEROUS LOAD-DO NOT USE!
    +10.0 110 103.40 3377 5066 89013 13765 100.0 1.101 !DANGEROUS LOAD-DO NOT USE!
     
  10. stxhunter

    stxhunter Well-Known Member

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    thanks pop thats really helpfull going to get a chrono in the near future when my father gets back from vaction where going to order some stuff chargemaster chrono and some other stuff. Tim i'll back it off to 94 till i get the chrono and see what its actually doing . Im not to worried about brass as long as i get 2or3 loads per case i'll be happy i look at like when i use to build and race mopars and peaple would ask how i could afford to spend 6 dollors a gallon on 112 octane race gas and i'd tell um if i was worried about the cost of fuel i wouldnt of built it /ubbthreads/images/graemlins/grin.gif but i will back it off for safety reasons thanks for all the info
     
  11. POP

    POP Well-Known Member

    Messages:
    1,474
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    [ QUOTE ]
    thanks pop thats really helpfull going to get a chrono in the near future when my father gets back from vaction where going to order some stuff chargemaster chrono and some other stuff. Tim i'll back it off to 94 till i get the chrono and see what its actually doing . Im not to worried about brass as long as i get 2or3 loads per case i'll be happy i look at like when i use to build and race mopars and peaple would ask how i could afford to spend 6 dollors a gallon on 112 octane race gas and i'd tell um if i was worried about the cost of fuel i wouldnt of built it /ubbthreads/images/graemlins/grin.gif but i will back it off for safety reasons thanks for all the info

    [/ QUOTE ]

    Remember now, quick load is not a panacea! It is just a reference to let you know you're doing. 94 sounds really good to me. That is waht I was shooting BTW.