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help with 300 mag

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  #1  
Unread 12-15-2008, 04:00 PM
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Join Date: Jan 2008
Posts: 15
help with 300 mag

shooting a 300 win mag sen.It has been accurized.Im shooting 180gr. accubond,75.5gr.re22,fed.primers,lapua brass.I am putting the bullet to factory OAL.6x24 burris black diamond w/target knobs.I cant get the groups out of it that i think the gun is capable of.What is a good group at 400 yds.Any advice on a different load or anything will sure help. thanks Terry
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  •   #2  
    Unread 12-15-2008, 08:47 PM
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    Join Date: Oct 2006
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    Re: help with 300 mag

    If I were you I would try both the 168 and 180 Berger VLD. My 300 Win Mag shoots the 168 the best with Ramshot Magnum. I've had great luck with Berger on game and paper.
    Good Luck,
    Tim
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      #3  
    Unread 12-15-2008, 09:01 PM
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    Join Date: Nov 2006
    Location: Dayton, Nevada
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    Re: help with 300 mag

    Your OAL. Are you loading to the book OAL? Or to the max OAL your magazine will fit?

    I'll also tell you that bergers shoot great. My 300 likes 190's with 81-82g of H1000.
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      #4  
    Unread 12-15-2008, 09:03 PM
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    Join Date: Jun 2006
    Location: buffalo, OK
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    Re: help with 300 mag

    Try changing your seating depth, when I shot 180 AB they liked to be around .010 off the lands. In almost all my guns they shot best groups for me around .010 - .015 off lands.
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      #5  
    Unread 12-15-2008, 11:16 PM
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    Join Date: Dec 2007
    Location: sebastopol, ca.
    Posts: 418
    Re: help with 300 mag

    My brother has a Sendoro and I have a Hart both in 300 win mag. My best groups are at 74.5 gr. RE22 with the 180 accubond and my brother is at 74.8 gr.
    Try backing your powder charge down and see what happens.
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      #6  
    Unread 12-16-2008, 07:41 AM
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    Join Date: Feb 2008
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    Re: help with 300 mag

    popwarlick,
    To answer the other part of your question, a good group @ 400yds would be 3" or less.
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      #7  
    Unread 12-16-2008, 08:13 AM
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    Join Date: Jun 2006
    Location: buffalo, OK
    Posts: 398
    Re: help with 300 mag

    I was looking through my old load data and 75.5 rl22 was my brother and I same load, mine was .010 off lands his was .020 off lands. Both guns shot around 1.5" groups @ 300 yards. I dont have coal as they were measured with stoney point gauge but i think it was somewhere around 3.55 - 3.6. That was about 1/2 gr off max load if I remember right so be careful if loading any higher. Most guns shoot better if the bullets are seated closer to the lands than factory coal. I would start at .010 0ff and work your way out a few thousands at a time and i bet you find a sweet spot. AB are good bullets.
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