Apparatus and method for calculating aiming point information for rifle scopes

  • US 6,516,699 B2
  • Filed: 06/14/2001
  • Issued: 02/11/2003
  • Est. Priority Date: 12/08/1997
  • Status: Expired due to Term
First Claim
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1. A hand-held electronic ballistics calculator for use by a sport shooter with a firearm having a barrel for firing a predetermined cartridge containing a bullet, said firearm equipped with a telescopic gunsight mounted adjacent to said barrel, said gunsight including an aiming reticle, said hand-held electronic ballistics calculator for accurately computing targeting information needed to hit a target at a known range comprising:

  • (a) a lightweight, hand-held computing device including a controller, memory, a means for inputting data, a means for displaying information, and a portable power source for powering the device;

    (b) a ballistics computer program installed in said memory for generating output needed to correctly aim the weapon at a target of known range using the aiming reticle of the gunsight, said program requiring the shooter to input in response to queries information regarding external conditions, information regarding the firearm and cartridge being used, and information regarding the range to, and movement of, the target, and wherein said information regarding the firearm and cartridge includes;

    the kind of telescopic gunsight being used;

    a distance between an optical center of the telescopic gunsight and an axial center of the barrel;

    bullet weight;

    ballistic coefficient of the bullet;

    muzzle velocity of the cartridge; and

    zero range for the firearm.

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