by Aaron Carter – Wednesday, November 18, 2015
Owing to its modular design, the adaptability of the modern sporting rifle (MSR) is unparalleled; in fact, it’s the only platform with which the highly subjective term “perfection” can be quickly, easily and affordably achieved for a large (and growing) segment of the shooting public. Given the quantity of both small- and large-scale AR parts and accessories manufacturers—particularly in the aftermarket—there’s something to satisfy even the most-discriminating palate. Such holds true of chamberings, too.
Within the AR-15 platform, however, where cartridge options range from .22 LR to .50 Beowulf, the ubiquitous 5.56 NATO still reigns supreme. But, quickly growing in popularity are the stalwart 7.62×39 mm and the newer .300 AAC Blackout that, ballistics-wise, can be quite similar. That’s where the primary parallels end; there are real, noteworthy differences to consider when contemplating the cartridge to best fit your shooting needs.