338 Rum & RL33 ?

Discussion in 'Reloading' started by denny, Sep 22, 2013.

  1. denny

    denny Member

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    Please share your load data; 338 RUM & RL33
     
  2. AZShooter

    AZShooter Well-Known Member

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    Alliant doesn't show many RL-33 loads. You will have to do some comparisons using 338 Lapua data which IS listed:

    338 Lapua 250 gr sierra mk, 103.5 gr RL 33 @ 3001
    338 Lapua 300 gr Sierra MK 97.5 gr RL 33 @ 2748 fps

    I had to figure out what to use with the 6mm-284, 7mm/375, 300 RUM and 257 Weatherby when it I got my hands on RL-33 over a year ago.

    My conclusion is to start with a midrange or slightly above midrange load data for Retumbo and work up from there.

    Based on my experiences RL-33 works best with the heaviest for caliber bullets.
     

  3. denny

    denny Member

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    Thanks for the response AZShooter. I'm going to start
    with 90 gr. RL33 under the Cutting Edge D59 252 gr.
    Bullet. I'll work up in 1 gr. increments from there ,
    Hoping to match retumbo's accuracy, & exceed it's
    velocity.Looking forward to trying the RL33 in the
    257 WBY as well. Thanks again denny.
     
  4. AZShooter

    AZShooter Well-Known Member

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    257 too? I have some load data for you. I used a 110 moly coated accubond.

    Original load 75.5 gr of RL-25 vel 3615 fps with 28" 3 groove barrel

    RL-33
    starting load 76 gr for vel of 3318
    jumped to 80 gr 3432 fps
    81 gr 3525
    82 gr 3559
    83 3625 which slightly faster than old load with RL-25
    83.5 3674 fps shot well two shots of four were same velocity
    84 gr 3704 fps shot well two shots of four were same velocity
    84.5 gr 3735 slight signs of pressure on one case of four this is max case capacity with drop tube