The question is simple. I'd assume that I'm going to encounter a good deal of 5.56 brass along with .223. If I'm going to be reloading with a .223 die, would 5.56 brass be safe to use with the die set? I'd assume that Mil-Spec Brass is going to be thicker and have different tolerances compared to .223.
Would attempting to load 5.56 brass in a .223 die end in disaster? Or, would it just be more difficult? Also, I'd assume pressure and case capacity is going to be different as well.
Got any general tips for loading rifle rounds when so far my experience is only with straight walled pistol cartridges so far?