I saw where poachers in Africa use AK-47's to kill elephants. The 7.62x39 round isn't an elephant load. However, with full metal jacket ammo and 30 round mags, enough holes are punched through the elephant to bring it down. That being said, I know of people who regularly kill deer with the .223. They use heavier bullets, but they can bring them down, usually head-neck shots, sometimes lungs. With fmj ammo, the .223 should be able to penetrate a bears head-neck area. Also, the ability to get multiple shots off on dangerous game helps. I also read in the American Rifleman a few months back that 20+% of all guns sold in the last couple of years are AR-15 platforms. Remington, S&W, Ruger, DPMS, Bushmaster, Olympic, and maybe others are making them now. I think parts and ammo will be around for a while. The AR-15 with the .223 ammo is today what the bolt action 1903 Springfield 30-06 was in the 20th centruy. If you have a family party to protect together, an AR-15, a 30-06 or .308 rifle, a .22LR rifle or pistol, and a 12 ga shotgun are an essential family arsenal. Add to that a .357/9mm convertable Ruger pistol and maybe a .357 rifle or a .44mag/pistol-rifle combo. This helps with ammo.