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Powder selection for RUMS

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  #1  
Unread 06-08-2006, 03:16 PM
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Powder selection for RUMS

I got some responses for powder selection for the 7RUM a week or so ago. I have a 338RUM also. Am I correct in assuming that slower powders would work better in the 7RUM than the 338RUM due to the smaller hole in a big case?
I loaded up 102gr of Retumbo behind a moly 225gr AB in my 338RUM and was hearing some powder crunching when I seated the bullet (OAL to fit in the mag). This load is below max and avg velocity was 3006 fps from a 26" barrel. I would like to hit 3100 fps but don't like crunching powder. I bought some H1000 which is a little faster and looks to generate the same pressure with a few grains less powder. I'm thinking that the H1000 would work better in the 338RUM and the Retumbo would work better in the 7RUM--I'm going to use 150 gr bullets. What say you?
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  •   #2  
    Unread 06-08-2006, 03:23 PM
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    Re: Powder selection for RUMS

    Sambo3006,

    Here are the burn rate of powders I recommend to my customers for each of the RUMS. These are general recommendations meaning any powder with similiar burn rates will perform equally as well.

    7mm and 300 RUM
    H-1000
    RL-25
    Retumbo

    338 RUM
    H-4831
    Rl-22

    375 RUM
    H4350
    H4831

    These generally get about all the performance you can get out of these rounds with a good level of load density.

    Retumbo is pretty slow for your 338 RUM, especially with a 225 gr pill. Look at some Rl-22 and see what happens. I suspect you will be suprised at the performance level you get and load densities will be a bit more powder friendly when seating bullets.

    Even H-1000 is a bit on the slow side. With 250 and 300 gr pills it would work well but not a 225.

    Retumbo seems to be one of "THE" powders for the 7mm RUM. 300 RUM as well.

    Kirby Allen(50)
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      #3  
    Unread 06-08-2006, 05:04 PM
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    Re: Powder selection for RUMS

    Thanks Kirby. This is exactly the type of info I was looking for. I have both RL 22 and IMR 7828 on hand. The max load on the IMR website for 225gr 7828 is 92 gr. I believe this is with the 225gr partition, so it may be a little different with the AB. RL 22 should be similar. I'll back off some and chrono test my way up while observing for pressure signs.
    Thanks again,
    Sam
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      #4  
    Unread 06-08-2006, 09:20 PM
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    Re: Powder selection for RUMS

    Should work well, keep us posted with the results!!

    Kirby Allen(50)
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      #5  
    Unread 06-08-2006, 10:41 PM
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    Re: Powder selection for RUMS

    I agree with Kirby. RL22 works great in the 338 ultra mag and produces top velocities and usually top accuracy as well. Nosler number 5 shows faster velos with RL25 and the 225 grain bullets but I have yet to see RL25 shoot faster than RL22.

    You could also burn RL22 in a 7 ultra in a pinch but your loading densities would be on the low side.
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