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Primers for 300 RUM w Retumbo

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  #1  
Unread 07-19-2004, 07:44 AM
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Primers for 300 RUM w Retumbo

Are you fella's using a magnum large rifle primer to ignite or just a large rifle primer? [img]images/icons/confused.gif[/img]
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  •   #2  
    Unread 07-19-2004, 10:12 AM
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    Re: Primers for 300 RUM w Retumbo

    Excellent question.

    Obviously magnum cartridges do great with magnum primers, however, there is the issue of consistency.

    You may find that using a regular primer like Fed. 210 match, the powder burns very evenly and uniformly.

    I tried this when I noticed some pressure signs using Retumbo. I was getting 1/2" 3 shot groups but #4 and #5 shots were expanding to 1".

    When I switched to the regular large rifle primer, the pressure went way down, I added powder, and got even better groups. But I do have a 28" barrel.

    Good luck, and good shooting!
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    Derek M.
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      #3  
    Unread 07-19-2004, 10:30 AM
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    Re: Primers for 300 RUM w Retumbo

    I also am using the 210 match with Retumbo in my 300 ultra. No problems [img]images/icons/blush.gif[/img]
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    Texas Dave
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      #4  
    Unread 07-19-2004, 04:22 PM
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    Re: Primers for 300 RUM w Retumbo

    You guys are a pain in the neck.

    If there weren't enough possible variations involved in load development, ie: powder, bullets, OAL, moly, and what-have-you; now you've gone and introduced another whole possibility to explore. Seems like I spend a thousand hours at the bench for every hour in the field. This isn't a hobby, its a disease.

    My wife is ready to divorce me. I refuse to give up my Fed 215M primers for the big guns. So there! [img]images/icons/grin.gif[/img]

    VH

    [ 07-19-2004: Message edited by: Varmint Hunter ]
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      #5  
    Unread 07-19-2004, 04:30 PM
    dwm dwm is offline
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    Re: Primers for 300 RUM w Retumbo

    This is a great thread, I've been using FED GM215 Match primers exclusively for the 7 SAUM and 7 RUM.

    Now I'm goiong to try the FED GM 210 Match primers since I have them also.

    Thanks,

    Doug
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      #6  
    Unread 07-19-2004, 05:58 PM
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    Re: Primers for 300 RUM w Retumbo

    All kidding aside - I'm rather surprised that you can adequately ignite 70gr-80gr-90gr of sloooow burning powder with non-magnum primers.

    If this will ultimately be a hunting load, the ignition quality may be quite different in a freezing cold environment. Not sure [img]images/icons/confused.gif[/img] just wondering.

    VH
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      #7  
    Unread 07-19-2004, 06:42 PM
     
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    Re: Primers for 300 RUM w Retumbo

    FWIW,I was at a 1000yd match in Tucson, AZ and saw where a guy was using F210's with Retumbo topped with 210 JLK's in a 300 Tomahawk and he had quite a few fail to ignite. Personally I wouldn't use anything but a magnum primer with Retumbo, JHMO.
    Wayne
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