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Scratching my head with 300 RUM

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  #1  
Unread 01-12-2010, 04:26 PM
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Scratching my head with 300 RUM

I went to the range today which is at 5500 ft in elevation. This time I wanted to try out the 200 gr Accubonds with Retumbo and Ramshot's Magnum powder. When I got to the max loads, this is where things got strange with the Sendero

200 gr AB with 98 gr of Magnum powder gave me velocities of ...

3,390
3,410
3,412
3,381
3,404
AVG Velocity is 3,399. That seems fast, perhaps too fast? 2 out of 5 shots showed signs of too much pressure by slightly sticky bolt and half moon shape on the rim of the case. The temp was 48 degrees. When I hunt it might be 80 degrees so should I back off a grain or two?

200 gr AB with 95 gr Retumbo gave me velocities of...

3,272
3,257,
3,277
3,261
3,254
3,247
3,294
3,297
3,274
3,259
AVg Velocity is 3,269. This seems about right on without any pressure signs.

Both had about the same accuracy. Has anyone else experienced high perfromance from Magnum like this before?
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  •   #2  
    Unread 01-12-2010, 04:54 PM
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    Re: Scratching my head with 300 RUM

    Way too fast! You're up there in pressures.
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      #3  
    Unread 01-12-2010, 05:26 PM
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    Re: Scratching my head with 300 RUM

    IMHO forget the temperature, I would back off 2 grains now!

    Last edited by Chas1; 01-27-2010 at 04:55 PM. Reason: no email notification
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      #4  
    Unread 01-12-2010, 05:47 PM
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    Re: Scratching my head with 300 RUM

    From your reactions, guess I'm happy to be alive

    This is the first time I've reloaded and had pressure signs. Kind of scary!

    For clarification... not the first time reloading, just first time with pressure signs.

    Last edited by tayhot; 01-12-2010 at 05:54 PM.
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      #5  
    Unread 01-12-2010, 05:58 PM
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    Re: Scratching my head with 300 RUM

    It's a good idea to have several load manuals for comparison and I always start below max loads and then work my way up slowly while looking for any signs of over pressure.
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      #6  
    Unread 01-12-2010, 07:06 PM
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    Re: Scratching my head with 300 RUM

    At 95 grs.Your .5 grs from maximum with the Retumbo 95.5 is a compressed load!
    based on the data from
    datahodgdon.com website
    I find they list higher grs. than my Hornady and Lyman reloading books.
    Starting load is 89.0
    Back it down
    Don't have the Magnum powder data handy

    Last edited by conn338rum; 01-12-2010 at 07:09 PM.
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      #7  
    Unread 01-12-2010, 08:37 PM
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    Re: Scratching my head with 300 RUM

    I use 95gr Retumbo, CCI250, 200grNAB and get 3280 with a custom built 27" Lilja. I would say you're running pretty hot to get that out of a 26" factory barrel.
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