The following ammunition cartridge ballistics information and chart can be used to approximately compare .243 Winchester vs .300 AAC Blackout ammo rounds. Please note, the following information reflects the estimated average ballistics for each caliber and does not pertain to a particular manufacturer, bullet weight, or jacketing type. As such, the following is for comparative information purposes only and should not be used to make precise predictions of the trajectory, performance, or true ballistics of any particular .243 Winchester or .300 AAC Blackout rounds for hunting, target shooting, plinking, or any other usage. The decision for which round is better for a given application should be made with complete information, and this article simply serves as a comparative guide, not the final say. For more detailed ballistics information please refer to the exact round in question or contact the manufacturer for the pertinent information. True .243 Winchester and .300 AAC Blackout ballistics information can vary widely from the displayed information, and it is important to understand that the particular characteristics of a given round can make a substantive difference in its true performance.
Caliber Type Velocity (fps) Energy (ft-lb) .243 Winchester Rifle 3180 1950 .300 AAC Blackout Rifle 2250 1350
Velocity
As illustrated in the chart, .243 Winchester rounds – on average – achieve a velocity of about 3180 feet per second (fps) while .300 AAC Blackout rounds travel at a velocity of 2250 fps. To put this into perspective, a Boeing 737 commercial airliner travels at a cruising speed of 600 mph, or 880 fps. That is to say, .243 Winchester bullets travel 3.6 times the speed of a 737 airplane at cruising speed, while .300 AAC Blackout bullets travel 2.6 times that same speed.
Various calibers
Energy
Furthermore, the muzzle energy of a .243 Winchester round averages out to 1950 ft-lb, while a .300 AAC Blackout round averages out to about 1350 ft-lb. One way to think about this is as such: a foot-pound is a unit of energy equal to the amount of energy required to raise a weight of one pound a distance of one foot. So a .243 Winchester round exits the barrel with kinetic energy equal to the energy required for linear vertical displacement of 1950 pounds through a one foot distance, while a .300 AAC Blackout round exiting the barrel has energy equal to the amount required to displace 1350 pounds over the same one foot distance. As a rule of thumb, when it comes to hunting, muzzle energy is what many hunters look at when deciding on what caliber of firearm / ammunition to select. Generally speaking, the higher the muzzle energy, the higher the stopping power. Again, the above is for comparative information purposes only, and you should consult the exact ballistics for the particular .243 Winchester or .300 AAC Blackout cartridge you’re looking at purchasing.
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