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Reloading Berger Bullets

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retumbo powder......pressure signs

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  #1  
Unread 01-24-2007, 06:03 PM
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retumbo powder......pressure signs

I am loading for my 7mm RM. Using 73 grains of Retumbo and a 168 berger vld. Not even the max load and I am having pressure signs on my cases and primers. The headstamp is getting marked up from the bolt face...

Anyone else seeing this when using Retumbo ? [img]/ubbthreads/images/graemlins/confused.gif[/img]
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  •   #2  
    Unread 01-24-2007, 06:44 PM
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    Re: retumbo powder......pressure signs

    Haven't used it at all in the 7RUM--a little in the 300 RUM.

    Haven't noticed what you are seeing. What is your velocity?

    Jim
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      #3  
    Unread 01-24-2007, 06:47 PM
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    Re: retumbo powder......pressure signs

    3143 avg. on 5 shot string with 21 fps from high to low
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      #4  
    Unread 01-24-2007, 07:05 PM
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    Re: retumbo powder......pressure signs

    Not sure where you are getting your data....here is hodgdons' website. Looks like you are right at max to me.

    http://data.hodgdon.com/main_menu.asp

    Also I've had good luck running retumbo in my 300 wby. All my loads have been perfectly "called" or guessed by my quickload program so I think it has the burn rate pretty well "nailed" on retumbo.

    I ran you load past quickload and it guesses you will do 3127 fps at 66,000 psi......

    I'd say you've hit the max....good job on watching signs!!
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      #5  
    Unread 01-24-2007, 07:21 PM
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    Re: retumbo powder......pressure signs

    I've had good luck with it too in my 7mm saum with 175's.
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      #6  
    Unread 01-24-2007, 07:37 PM
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    Re: retumbo powder......pressure signs

    I was shooting 93 gr of Retumbo with the 168 Berger in my 7 RUM, 215's with a 32.5" bbl. Killer accuracy, killer velocity, 3580 fps, and also killer on the cases. Only get one or two reloads before the primer pocket opend up. Every once in a while I would blow them up on the way down range.
    One day I walked it down to 85.0 gr in one grain increments to see where accuracy and velocity fell off. I ended up with 85.0 gr at 3300fps with the same killer accuracy, and an ES of 15 fps. Cases now survive about five or six reloads. You may have a tight barrel. Try doing what I did, you may find that comfortable load on the bottom.
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      #7  
    Unread 01-24-2007, 09:49 PM
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    Re: retumbo powder......pressure signs

    Thanks guys....

    Joel, i will try that....

    Thanks Kraky for running that...

    Yotes
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