Howdy,
I just acquired a bolt action rifle which is stamped 5.56/.223 for the purposes of varmint/predator hunting.  I have zero experience with the caliber(s) and had a couple of questions:
   -  When would I shoot 5.56 rather than .223?
   -  Good source for Ammo?
   -  Good price per round?  
   -  Should I be bulk buying 5.56 or .223?
   -  Is it worth paying top dollar for the match grade ammo if I'm hunting?
I'm not a reloader and have minimal interest in ever doing that, so I'd be purchasing from some source.  Understanding the 5.56 rounds can be higher pressure and higher velocity etc. would I use those as my hunting rounds or are the .223 fine for Coyote, skunk, fox, feral cats, etc.   I know there can be a real sense of pride to sub MOA groups out to 600-900 yards, but doubt that will be me, so for normal 200-300 yard shooting in hunting situations how should I approach this?
			
