G7 vs G1 BC

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Gernest2, Aug 5, 2013.

  1. Gernest2

    Gernest2 Member

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    Jul 28, 2013
    Okay I'm new to this whole thing so please bear with me... Why is the difference between the two BC's and when do I use which one. Thanks
     
  2. JackinSD

    JackinSD Well-Known Member

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  3. Beng

    Beng Well-Known Member

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    They use different bullets for comparison. The G1 projectile is a flatbase shortnosed bullet, the G7 is a boattail pointed nose design. If you shoot a boattail bullet use the G7 coefficient.

    Buy Applied Ballistics for Long Range Shooting, it will teach you the basic theory behind external ballistics applicable for lr shooting.
     
  4. cohunter14

    cohunter14 Well-Known Member

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    Yep, x2...great book too
     
  5. J E Custom

    J E Custom Well-Known Member

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    With the older style bullets the G1 was OK but now with all of the high BC bullets the old model is
    just not accurate when trying to develop a drop chart.

    The real problem is that the manufactures can use ether the G1 or the G7, and if you were a manufacture
    would you want to say your bullet has a BC of .400 when everyone else was using the G1 method and claiming a BC of .700+.

    In testing a long range load you will find that the G7 BCs are closer to actual drop And can be
    very accurate to calculate ACTUAL BCs of your bullet.

    If you can get past the lower numbers, the G7 method is the best.

    Just my opinion

    J E CUSTOM