The .300 AAC Blackout a.k.a the .300 Blk or just .300 Blackout is a rimless, bottlenecked, intermediate centerfire rifle cartridge that fires a .308-inch diameter bullet.. 300 Blackout vs 308: Costs, Availability, & Compatibility. After looking at the best applications, now let's turn towards the pricing, availability, and upgrade factors.. Energy. Furthermore, the muzzle energy of a .300 AAC Blackout round averages out to 1350 ft-lb, while a .308 Winchester round averages out to about 2620 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.

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The .308 Winchester hunting round travels at a speed of 2,680 fps compared to the.300 AAC Blackout cartridge's 2,250 fps, meaning that at 500 yards, the.308 cartridge travels at 500 fps greater than the .300. The average velocity of supersonic ammunition for the.300 is roughly 1,125 fps, whereas subsonic ammunition has a few less fps.. The 300 AAC Blackout and 308 Winchester are both rifle cartridges with a 30-caliber design that use a .308″ diameter bullet. However, their similarities end there, as these cartridges serve different purposes. In this comprehensive comparison, we will delve into the 300 AAC Blackout and the 308 Winchester, focusing on their intended uses.