I found a Redington Redfly rod that is labeled 5/6, and I'm somewhat confused, I thought rods were line specific. I want to use 6 weight line. What would be the difference in using this one, or just using a 6 weight line on a 5 weight rod I already have? It's a 9 foot, 2-peice, I want to use it to throw some poppers until i can get an 8 weight set up.