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Thread: 300 RUM loads

  1. #1

    300 RUM loads

    Just thought I would start a thread where we could share some 300 RUM load info.

    My pet load with the 300 RUM thus far has been 87grs H1000 with 210gr Berger Hunting VLD, getting 2885fps with 11fps ES out of an off the shelf Sendero.

    Load data that I've received from Walt Berger for the 210 VLD

    H1000 85.3grs 2833fps to 91.6grs 3038fps

    RETUMBO 85.5grs 2844fps to 92.0grs 3035fps

    Ramshot Magnum 86.0grs 2835fps 90.8grs 2995fps

    Please feel free to add loads tips or tricks for the 300 RUM

    Mtnguy78

  2. #2
    I'll post an old load I worked up with the 210's. With the introduction of the 215 and 230 Hybrids I wont be using the 210's anymore but for those who do, here's what I came up with.

    210's seat about .020 off the lands in a factory Sendero
    93 Retumbo
    Rem brass
    215 primers
    MV about 3130
    Accuracy about .5 MOA

    While I'm at it, here's a load for the 180 E-Tips seated about .020 of the lands same rifle.
    98 Retumbo
    Rem brass
    215 primers
    MV about 3400
    Accuracy about .4 MOA

    I did no load development for these other than to find the max load and use that. No other charges were used other than to climb the pressure ladder and no seating variations.

    I have a new 300 RUM now that I will start load development for in about 2 weeks and report back with new info on new bullets and powders. RL33 is looking very promising for the heavy bullets.

  3. #3
    Very interested on how the RL 33 works out.

    What's your load for the 230's if you don't mind?

  4. #4
    Ryan, I do not have an RL33 load for the RUM yet. I did use it (90 gr) with the 230's to do a break-in. My barrel is being sent for nitriding today and when it gets back in a couple of weeks I'll begin load development. I'll definitely share it with the forum.

  5. #5
    215 VLD
    H1000 88.7 GN
    remington brass neck sized only
    federal 215 primer
    40 off the lands
    2970 FPS very mild load
    will shoot .5 out to 600 yards farthest I have shot it ?

  6. #6
    Quote Originally Posted by MontanaRifleman View Post
    Ryan, I do not have an RL33 load for the RUM yet. I did use it (90 gr) with the 230's to do a break-in. My barrel is being sent for nitriding today and when it gets back in a couple of weeks I'll begin load development. I'll definitely share it with the forum.
    you will have to let us know how that gun does with the nitride? i have wondered and have heard about even both go and no big deal

  7. #7
    Quote Originally Posted by caleb View Post
    you will have to let us know how that gun does with the nitride? i have wondered and have heard about even both go and no big deal
    Caleb, I procratinated a little and only got my rifles back to the smith about a week and a half ago. also been out of town a lot and will be on and off for the next couple of months but i hope to get them back and start shooting in a couple of weeks or so. It may take a while to draw any conclusions. It will be interesting to see what velocity I'll get and how well the barrel cleans.

  8. #8
    I have a Sendero SF in 300 Rum. Fully bedded and braked!


    I have had great success with the 220 gr SMK, 90 gr H1000, and Federal 215M primers! COAL is 3.6850. It will shoot under 1/2" all day! I've been shooting this load for the last 12 years. I wanted to switch over to the Bergers, however, my opinion is, don't fix it if it isn't broken!
    Last edited by C.O. Shooter; 11-14-2013 at 06:43.
    "The only thing necessary for the triumph of evil is for good men to do nothing"

  9. #9
    Has any body worked up some nice loads for the 230 otms yet?
    Speak softly and carry a big stick.
    Teddy Roosevelt

  10. #10
    Finally completed my load developement and settled on 90gr. of Retumbo with an ES of 12fps and an average of 3070fps over 4 rounds at
    3064,3067,3076,3076 FPS.
    Seated at 3.810 COAL printing 3/8" groups at 100yds. Ready to go long !

    Also ran a short ladder with some H1000 :
    87gr.-3004,2969,2970,2986
    88gr.-3035,3065,3021,3071
    89gr.-3063,3043,3046,3058
    90gr.-3113,3078,3094,3140
    91gr.-3121,3115,3109,3109

    Faint ejector marks at 89g.
    Ejector marks and flattend primers at 90gr.
    Stiff bolt lift at 91gr.

    As always start low and run your own ladder testing in your rifle to determine a safe load.

    Viper, There is more info on this over in the New Builds section.
    I went from a New Build right into load developement so it kind of stood there.

    Mando

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