The AR-15, a platform frequently dismissed in serious discussions of bear defense, warrants a critical re-evaluation, according to an article originally published on www.outdoorlife.com. While traditional wisdom points to heavy hitters like the .45/70, 12-gauge slug guns, or the .375 H&H, a compelling case is being made for the AR-15, particularly when factoring in real-world defensive encounters and modern ammunition.
The prevalent dogma often prioritizes sheer 'knockdown power' above factors truly dictating a successful defense scenario. As the source highlights, such discussions frequently overlook the real-world necessity for rapid, multiple, accurate impacts, even with magnum cartridges. Bears rarely drop instantly unless a central nervous system hit is achieved, making shot placement and follow-up capability paramount.
The AR-15's inherent speed and intuitive ergonomics stand out. It is light, handy, modular, easy to shoot, and its reliability has been honed over six decades. These attributes directly align with the demands of a rapid-response defensive tool. While the common perception labels the .223/5.56 NATO cartridge as insufficient, comprehensive testing reveals a more nuanced reality.
To compare handling and speed, an AR-15 in .223 and an AR-10 in .308 were pitted against traditional options: a .375 Ruger and a .45/70. In drills testing the speed of a single shot from a slung position, the AR platform demonstrated a distinct advantage in rapid deployment. Further tests on staggered targets, including a State of Alaska charging grizzly silhouette and clay pigeons, showed the ARs consistently outperforming the larger rifles by several seconds, maintaining equal or superior accuracy. This suggests that if only one shot is achievable under duress, the AR's speed and precision could offer a better chance at a vital hit.
Terminal ballistics validation was conducted with various .223 projectiles in ballistic gel, alongside established bear loads from a 10mm Auto, .44 Magnum, and .45/70. While hard-cast handgun and rifle loads provided excellent penetration with minimal permanent wound cavities, select .223 bullets delivered impressive results. The 54-grain G9 Defense Barrier Blind and 62-grain Lehigh Defense Controlled Chaos copper projectiles expanded violently, shedding petals, with their bases penetrating approximately 22 inches. The 50-grain Barnes TTSX created an excellent wound cavity for about 10 inches before halting at 15 inches of penetration. Among lead-core options, the 77-grain Sierra TMK, a match bullet, penetrated further than the 55-grain Speer Gold Dot and produced a larger permanent wound cavity than any other projectile tested, including the larger hard-cast controls.
While the copper and 77-grain TMK .223 loads yielded more dramatic wound cavities than the hard-cast counterparts, they typically showed less overall penetration. Other AR-15 chamberings, such as the .300 HAM’R and .350 Legend, also demonstrated significant viability in gel tests, with the .300 HAM'R achieving over 32 inches of penetration.
Ultimately, the assessment concluded that while the AR-15 may not replace a dedicated heavy bear gun for those already proficient with one, it is a far more realistic and capable bear defense tool than commonly acknowledged, especially for black bears or as a general-purpose rifle around camp, provided the shooter is equipped with appropriate modern ammunition.
