These days, the rod manufacturer that seems to be the most explicit about specifying different actions within a given model series is Orvis. I know with their Helios rods, the would list them as either mid flex or tip flex and even have a flex number designation. I haven't checked a Winston catalog in a few years, but know that in the past they would carefully denote rod weight, length and action (slow, medium, fast) and even specify appropriate casting distances for each rod.