Monday, 4/20/15: The recent attempt by the federal Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) to ban a type of  5.56mm ammunition designed for use in AR-15 and other rifles chambered for this caliber on the strength of the argument that at least a few handguns are now chambered for this caliber and that the ammunition in question is "armor-piercing" ammunition prohibited by federal law from being made available in handgun calibers highlights the advisability of the prudent survivalist equipping himself with one or more defensive rifles in calibers not typically associated with handguns: e.g., .308 Winchester (known in its military loadings as 7.62mm NATO), .30-'06, etc.  Moreover, shot for shot, these calibers are far more effective than the 5.56mm (known in its commercial loadings as the .223 Remington) in terms of stopping power, target penetration and long-range capabilities, which are all factors worthy of being considered, along with the fact that magazine capacity limitation laws in several states prevent one from realizing the otherwise higher ammunition capacity of smaller-caliber defensive rifles like the AR-15 and the Soviet-designed AK-74 (chambered in 5.45x39mm).