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need some B.C. info please

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  #1  
Unread 12-31-2003, 01:22 AM
 
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need some B.C. info please

I was wondering if any of you fellas have the BC for the 178gr A-max 30cal bullet
and the 175gr MatchKing.

Thanks for any help.
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  •   #2  
    Unread 12-31-2003, 04:38 AM
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    Join Date: Jun 2007
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    Re: need some B.C. info please

    Bullet BC for more common LR bullets

    6.5 Caliber
    Sierra 142 .595@2850
    Berger 140 .633@2240
    JLK 140 (B) .630
    Clinch River 147 _____
    AMAX 140 .618@2400
    Cauterucio 141 .630

    7mm Caliber
    JLK 168 .690
    JLK 180 .738
    Cauterucio 156 .615
    Cauterucio 176 ____
    Berger 168 .648
    Berger 180 .738
    AMAX 162 .625

    30 Caliber
    Sierra 168 MK .462
    Sierra 180 MK .475
    Sierra 190 MK .533
    Sierra 200 MK .565
    Sierra 220 MK .629
    Sierra 240 MK .711
    Berger 168 .512
    Berger 175 .537
    Berger 185 .569
    Berger 190 .583
    Berger 210 .640
    JLK 190 .602
    JLK 210 .665
    AMAX 168 .475
    AMAX 178 .495
    Cauterucio 190 ____
    Cauterucio 210 ____
    Clinch River 216 ____

    338 Caliber
    Sierra 250 MK .565
    Sierra 300 MK .797
    Hornady 225 SST .526

    anyone have any updates on other bullets, post them and I will add them to list


    BH

    [ 12-31-2003: Message edited by: BountyHunter ]
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      #3  
    Unread 12-31-2003, 06:11 AM
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    Re: need some B.C. info please

    Fill in the blank

    7mm -- 176 Cauterucio is .750
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      #4  
    Unread 12-31-2003, 10:30 AM
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    Re: need some B.C. info please

    The published BC for the 178 AMAX is .496, most shooters will agree that its more like .525 The 175 Sierra MK is published at .495-.505 I think this is fairly close. It may be increased slightly depending on rifle type, but it will be close to .500
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      #5  
    Unread 01-01-2004, 12:06 AM
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    Re: need some B.C. info please

    problem with Hornady BC is that the method they use is not published and BC vary a lot of the atmo parameter , initial velocity , drag curve they use ( Hornady are secant not tangent bullet anf G1 is not for secant ogive bullet )

    but I far prefer an honnest lower value than amazing hight BC publish by some maker , even if custom bullet from Clinch , JLK , or Cautericio are very hight in real

    best is to check accuracy first and when you find something accurate in your rifle you check elevation you need from your zero ( 100 or 200 ) to you target at 1 K

    good shooting

    DAN TEC

    good shooting
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      #6  
    Unread 01-01-2004, 11:21 PM
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    Re: need some B.C. info please

    JDJones75,
    Glad to see ya made it! Enjoy.
    Dave in Idaho
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      #7  
    Unread 01-02-2004, 07:40 AM
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    Re: need some B.C. info please

    DAN TECH

    For what it's worth, the BC's that Bob C. gave me for his two 7mm bullets were right on when I shot them.
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