Rutumbo in a 300 Ultra

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by texasdave, Jul 24, 2004.

  1. texasdave

    texasdave Well-Known Member

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    I was at the range yesterday and found that from 90 to 92 grains of powder I was not increasing the bullet speed but by 50 feet. It went from 3090 to 3140 but I was increasing the fireball I threw. It seems to me that I was only burning more powder out front of the rifle. I switched to R22 and at the same 92 grains I increased the speed of the bullet to 3650 and was not throwing a fireball at all. I just wonder what anyone else has found using Retumbo. It seems the powder is too slow for my rifle even though it is supposed to be for large magnum rifles.
     
  2. D.P.

    D.P. Well-Known Member

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    what weight bullet and barrel length?
     
  3. texasdave

    texasdave Well-Known Member

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    It was a 165 grain bullet and 28" barrel
     
  4. D.P.

    D.P. Well-Known Member

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    I think you will find that with heavier bullets the Retumbo will perform well. I am getting ready to load some 200 Accu Bonds useig Retumbo. I don't have much experience with the 300 RUM, But have seen good results in friends rifles with heavy bullets and Retumbo and R-25. In my experience with my 300 win R-25 was awesome with 180 NBT's but when I stepped down to 165's R-22 took over (3430 FPS 26" barrel)
     
  5. Guest

    Guest Guest

    I am pushing a 200 gr bullet(Nosler Accubond) at 3200 with Retumbo at 94.5 gr.Retumbo is designed for the heavier bullets...Like rimfire said, stick with R22 for the lighter ones.
     
  6. sniper2

    sniper2 Well-Known Member

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    Try some WMR if you can find some, great velocity and accuracy!!
     
  7. JustC

    JustC Well-Known Member

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    I have gotten ~3200fps thus far from 89gr of retumbo under a 216gr clinch river with groups in the .2"s (30" 1:10 PacNor select)

    For the 200gr SMK,..88.0gr H1000 gave .25moa groupings as well at ~3100fps.

    For the 165's,..I think your wayyyyyy tooooo sloooooww with retumbo or even RL25.
     
  8. texasdave

    texasdave Well-Known Member

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    Thanks for all the info. I tried Retumbo yesterday using 200 Accubonds and 90 grains of powder. I was beginning to get extractor marks so it looked as though that was as high as I could go. I was only getting a little over 3100 in speed. I was not able to tell if I still got a fireball but I am thinking for my rifle Retumbo is still too slow. At least I am not able to obtain the speed others are getting. Maybe Ill try H1000 or R 25 next.
    I did switch to R22 and at 91.5 grains I was getting over 3650 average and und .5 groups. I appreciate everyone input and advice.
    Thanks