Q:

How do you use a .223 ballistics trajectory table?

A:

Quick Answer

Begin with the desired range, measured in yards, to determine the drop, velocity, energy and time with which a .223-caliber bullet reaches its target. Bullet weight, casing and velocity of the bullet upon exiting the barrel of a gun also affect a given bullet's trajectory.

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Full Answer

Trajectory charts typically measure bullet drop in inches, velocity in feet per inch, energy in pounds per feet, and time in milliseconds. Bullet trajectory charts make use of a number of fixed variables to determine the drop, velocity, energy and time of a bullet's trajectory. In addition to bullet weight, casing and exit velocity, charts generally assume the presence of a standard size scope mount to accurately calculate drop. Trajectory charts typically do not take atmospheric conditions into consideration, but more advanced ballistic calculators do.

Using a .223 trajectory chart requires knowledge of all fixed variables and the distance of the target from the barrel of the gun. For example, a .223 metal-cased Remington round weighing 55 grams and exiting the barrel with a velocity of 3,215 feet per second reaches a target 500 yards away in less than a second, dropping approximately 64 inches and losing 1000 pounds per feet of energy in the process.

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