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300 RUM/ 220MK's??

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  #1  
Unread 01-12-2007, 01:34 PM
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300 RUM/ 220MK\'s??

Anybody loading 220 matchkings in the 300 RUM? Seems like alot of you are fond of the 200 accubond, anybody shoot anything different? I'm not that interested in the 180's.
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    Unread 01-12-2007, 02:03 PM
    POP POP is offline
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    Re: 300 RUM/ 220MK\'s??

    I can help with the Accubonds but not with the sierras.

    92 gr of RL 25 and 86 gr of Retumbo worked wonders with the 300 rum/200 AB combination. 3150 fps or so and phenomenal Accuracy through my SAKO 75. Under 1" at 300 yards---average.
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      #3  
    Unread 01-20-2007, 12:47 PM
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    Re: 300 RUM/ 220MK\'s??

    Pop, I thought Retumbo was a much slower burning powder than RL25 so I am surprised to see that you are using quite a bit less of it than of the RL25, yet still getting basically the same velocity. Did you mean to say you are using 96 grains of Retumbo? Thanks, Brian.
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    Unread 01-20-2007, 01:21 PM
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    Re: 300 RUM/ 220MK\'s??

    On average, RL-25 and Retumbo are very similar as far as charge weight and velocity. It will largley be determined by lot numbers though. If you have a slightly slower lot of RL-25 and a slightly faster lot of Retumbo, you will get these differances and vice versa. One thing though, it seems as if Retumbo beats up my brass alot more than RL-25 at the same velocities.
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    Unread 01-21-2007, 07:38 AM
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    Re: 300 RUM/ 220MK\'s??

    RL 25 in my 300UM works best. The 220 SMKs shoot well, but the 210 JLKs group better. And for a hunting bullet, the Barnes 200 TSXs are my choice.
    db
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      #6  
    Unread 01-21-2007, 08:11 AM
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    Re: 300 RUM/ 220MK\'s??

    [ QUOTE ]
    RL 25 in my 300UM works best. The 220 SMKs shoot well, but the 210 JLKs group better. And for a hunting bullet, the Barnes 200 TSXs are my choice.
    db

    [/ QUOTE ]

    Unfortunately, based on his email to me last night, Swampy (JLK owner) says their 30 caliber die was damaged and will not be repaired until late spring/early summer.

    James
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    Unread 01-21-2007, 12:29 PM
    POP POP is offline
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    Re: 300 RUM/ 220MK\'s??

    You are correct sir:

    the retumbo load is infact 96 not 86 of retumbo.......
    sorry
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