Complete neophyte with this caliber, curious about uses for it. Primary interest would be defensive, though it appears that this caliber is also used for at least smaller game. What do you recommend this caliber for and why? Any particular rifles that you recommend in this caliber - again, why? I am ".223-curious," considering whether there is any sort of "ideal" rifle in the caliber - at least any that are reasonable in cost. Thanks for any input.