7.62x39mm Ballistics Chart & Coefficient
Article Posted: July 11, 2012
This is a 7.62x39mm ballistics chart (external) generated using our ballistic trajectory calculator. This round is most used in AK-47s and their variants.. The average 7.62x39mm bullet is something like a 123 grain that is fired at an average of at 2,350fps The charting below follows the trajectory all the way to 1000 yards in steps of 50 yard increments. The table below shows the range, drop (based off a 1.5" scope mount although most AKs dont have scopes), current velocity, energy, and time in seconds in relation to the bullets movement through space and time. This chart shows now effects of wind or atmosphere, but if you want to take in to effect these things check out the calculators official page. The Ballistic Coefficient for the 123gr 7.62x39mm is somewhere around .275 (in this example). The 7.62x39mm has a known ballistic coeficient of between .225 (a 123 gr bullet) and .325 (a 150 grain bullet), a very large range in deed.
|Range (yards)||Drop (inches)||Velocity||Energy||Time (seconds)|
So what does the charting of the 7.62x39mms external ballistics tell us exactly? It says that at around the halfway point of 500 yards the bullet has lost more than 55% of its velocity, lost just under 1,200 ft pounds of energy (now pushing just 310 lbs), and dropped due to gravitational forces some 120 some inches, and all of this in just a fraction of a second (.69 seconds). This drop is much more than the .223 Remington round in which will have only dropped 50" in 500 yards. This huge drop may play a role in the AKs long distance in-accuracy. This is due to the fact that the 7.62x39mm is a much heavier round. All of this have happened in 1 second.
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