are these interchangable now? I was thinking of mentioning use of Caliber to mean Cartrdige in antother thread, but - is just seems so common now, is that correct we just can interchange them? Or is it a square is a rectangle, but a rectable is not a square. A Caliber can be a Cartrdige, but a Cartrdige can no be a caliber .. a Cartrdige has a Caliber, but it can not be one. Just curious what others think. I know mostly now I just shrug and move on and figure the ones who say Caliber no matter how incorrect this seems have won by a majority.