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338 Allen Xpress, RL33 load development

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  #8  
Unread 09-04-2013, 06:37 PM
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Re: 338 Allen Xpress, RL33 load development

Kirby,

Thanks for testing and great post. The results of +100 fps over Retumbo are not a surprise. Do you have any plans with testing RL-33 for possible temperature regression computations? Upper 80's in the late afternoons and cooling off in the mornings for this weekend. Retumbo Extreme powder MV regression comparison to RL-33???
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  •   #9  
    Unread 09-04-2013, 06:44 PM
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    Re: 338 Allen Xpress, RL33 load development

    Quote:
    Originally Posted by Fiftydriver View Post

    I hate to use the term magical but I do think in the 300 AX, it may be even more impressive then it is in the 338 AX. Time will tell. Now I just have to find some of that elusive time!!!
    I hope you're right about the big 300's, I have visions of 230 Hybrids @ 3200 fps + out of my RUM
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      #10  
    Unread 09-04-2013, 07:08 PM
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    Re: 338 Allen Xpress, RL33 load development

    Quote:
    Originally Posted by MMERSS View Post
    Kirby,

    Thanks for testing and great post. The results of +100 fps over Retumbo are not a surprise. Do you have any plans with testing RL-33 for possible temperature regression computations? Upper 80's in the late afternoons and cooling off in the mornings for this weekend. Retumbo Extreme powder MV regression comparison to RL-33???
    Its on the TO DO list but so are 30 customer rifles and they get priority so will get testing done when I can. This time of year is hard to do much of my personal testing so if I can combine it with testing customers rifles I can kill a couple birds with one stone.

    its in the plans though.
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    Kirby Allen(50)

    Allen Precision Shooting
    Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

    Farther, Faster and Flatter then ever before.

    Web Page: www.apsrifles.com

    allenmagnum@gmail.com
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      #11  
    Unread 09-04-2013, 07:09 PM
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    Re: 338 Allen Xpress, RL33 load development

    Quote:
    Originally Posted by MontanaRifleman View Post
    I hope you're right about the big 300's, I have visions of 230 Hybrids @ 3200 fps + out of my RUM
    What is your barrel length? I am currently getting 3325 fps out of my 300 AX in my Raptor LRSS with 30" barrel length using Retumbo with the 230 gr Hybrid. The 240s go around 3250 fps but they have a much longer baring surface compared to the Berger.

    I would think that 3200 fps with RL33 will be very practical in the big RUM.
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    Kirby Allen(50)

    Allen Precision Shooting
    Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

    Farther, Faster and Flatter then ever before.

    Web Page: www.apsrifles.com

    allenmagnum@gmail.com
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      #12  
    Unread 09-04-2013, 07:20 PM
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    Re: 338 Allen Xpress, RL33 load development

    Quote:
    Originally Posted by Fiftydriver View Post
    What is your barrel length? I am currently getting 3325 fps out of my 300 AX in my Raptor LRSS with 30" barrel length using Retumbo with the 230 gr Hybrid. The 240s go around 3250 fps but they have a much longer baring surface compared to the Berger.

    I would think that 3200 fps with RL33 will be very practical in the big RUM.
    It's a 5C Broughton, only 27" long for mobility. I am having it nitrided so hoping for a little velocity gain there as well. I'm guessing my case capacity, based on some other reports, to be right about 99-100%. 3325 is smoking.
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      #13  
    Unread 09-04-2013, 10:08 PM
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    Re: 338 Allen Xpress, RL33 load development

    Can't wait to see the results out of the 300AX.
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      #14  
    Unread 09-05-2013, 06:31 AM
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    Join Date: Dec 2005
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    Re: 338 Allen Xpress, RL33 load development

    Thanks for the information Kirby. This confirms the data I gathered over a year ago with smaller cartridges. RL-33 with its longer burning curve yielded higher velocities than max loads of RL-25 or Retumbo.

    The 6mm-284:
    58 gr of Retumbo, 105 Berger target hybrid seated .065" off rifling vel 3307 fps
    64 gr of RL-33 same data for bullet........................................... vel 3485 fps

    257 Weatherby:
    moly coated 110 accubond, .015" off rifling.

    Original load 75.5 gr of RL-25 vel 3615 fps
    84.5 gr of RL-33 vel 3735 fps



    I have no earlier powder comparison for 300 RUM but did get good results in both accuracy and velocity.

    I wanted to shoot the 230 berger match target hybrid but current barrel didn't have correct twist. I rechambered a 24" ss rem takeoff and worked up to 102 gr of RL-33 which showed the beginnings of pressure. Dropped to 100 gr for velocity of 2975 fps. Not bad for such a short barrel.

    Keep up the testing. Many of us are interested.

    Ross
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