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Here is the only true rule when it comes to trajectory versus the curvature of the earth:  Any objective/projectile will not drop when fired from an elevation as opposed to firing from ground level.  Example:  A 30 caliber fired for impact at 100yds has a specified amount of drop.  When the same identical bullet is fired from an angle, regardless if that angle is uphill or down, the bullet will not drop as much.  There are tables and formulas that can calculate the factor based on the known angle of fire, but to carry the necessary tools to calculate the angle of fire, than take the time to crunch the numbers is time consuming.  Basically, there is a difference of .5" to 1" at 100yds.  Granted, this value is going to change with distance, bullet weight, design, caliber, etc, etc.  Many archery hunters miss dear from tree stands because the allow for an arrow to drop further then the earth will allow.  Things that make you go hmmmmmmmmm....

Message Thread:

• Uphill / Downhill Trajectories ?? BamaBBQ1 Aug 29 2005
  • Bullet drop on a slope... Murphy Aug 30 2005
  • MildotMaster/SlopeDoper GaryVA Aug 30 2005
    • gravity?? mariner Aug 30 2005
      • Gravity!!! Murphy Aug 31 2005
      • mariner GaryVA Aug 30 2005
  • well... Ray Aug 30 2005
    • bullet traj vs curvature of the earth mariner Aug 30 2005
      • To calculate the drop... mariner Aug 30 2005
        • More info, or too much?? mariner Aug 30 2005
          • more info cdhunt Aug 30 2005