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284 Jazz

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  #15  
Unread 04-04-2010, 04:19 PM
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Re: 284 Jazz

Sorry guys I know some of you are waiting on some results of this caliber. I just got my power back on, it has been out for 3+days. Pretty bad storm swept our area on Friday. Alot of people are without power, I am lucky some will be for a week or more. Hopefully I will be able to get out With the guy who built it this weekend to do some developing.



Brent
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Last edited by blipelt; 04-10-2010 at 10:11 PM. Reason: spelling
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  •   #16  
    Unread 04-05-2010, 05:45 AM
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    Re: 284 Jazz

    Brent,
    Will you be trying Retumbo in your JAZZ ?
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      #17  
    Unread 04-05-2010, 06:41 PM
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    Re: 284 Jazz

    Retumbo, us 869, H1000 and 50bmg I will be trying first with the 180 and 189's.


    Brent
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      #18  
    Unread 04-10-2010, 09:28 AM
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    Re: 284 Jazz

    Guys I will let Nate reply on what all he offers ex. fireforming. All I can mention is what he helped me with. The Jazz is a new caliber so he is helping me out with getting started. I am a novice compared to alot on this site. We stepped the .338 down to a .30 and then to the .284. With Nate's rec. we fireformed with 90grs. of US869 and a 180 berger. We loaded up 25. Now these groups are fireforming and cleaning (15 cleaned after each and then every three).




    .755 five shot group





    this is a three shot group at .52. The upper one was when I was zeroing the rifle.
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    Last edited by blipelt; 04-10-2010 at 09:34 AM.
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      #19  
    Unread 04-10-2010, 09:57 AM
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    Re: 284 Jazz

    How would this case push the 200gr wildact? Was planning on a 7mm/338 lapua build but this has sparked some interest also.
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      #20  
    Unread 04-10-2010, 03:51 PM
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    Re: 284 Jazz

    I don't know yet about the 200 wildcats but I can tell you some results myself and Nate learned this afternoon. First off it was a terrible day to do any shooting. When we planned it the forecast called for 58 and breezey. I guess breezey means 25-35mph guts from every direction it seemed. The wind was so bad while laying prone it would blow you off your target a couple of inches.


    We used Bob C. 189's with US869 powder and fed match mag primers.

    Eight of nine shots with 97.2grs of US869 had a velocity of 3205-3212. The ninth was 15fps less. ES of 7fps. With 98grs. Nate noticed a slight change in bolt lift with a velocity of 3267fps. I am sure you can push it over 3200, but I am not after the max performance. The group averaged .8moa throughout the testing(94-98grs), but it is tough to group in the conditions we had. When it gets nicer this evening hopefully I will get out and do some grouping with this load. Hopefully Nate will chime in and add since I am sure I missed quite a bit of important information.

    Nate at SSG did custom dies and shell holder for this caliber, he also has brass on hand.

    Brent
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    Last edited by blipelt; 04-13-2010 at 07:40 AM. Reason: more
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      #21  
    Unread 04-10-2010, 05:23 PM
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    Re: 284 Jazz

    Pretty nice fluting, good looking rig. Enjoy.
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