Originally Posted by fredaevans
Just to add to what MP's said above, the 510 is the MINIMUM number of grains. But that's just for a shooting head so decide what what kind of line you want and go from there. Both RIO and AirFlo have on line recommendations for almost any 2hander out there. As an example a 510 would just be a light Skagit that probably would even load a 10/11 weight rod.
To add to this, I have a 600 grain skagit line on my deer creek 13'6 8/9wt. I would think that you would want a heavier grain weight, but this is just my assumption. Here are some charts from rio http://www.rioproducts.com/skin/summ..._Line_Recs.pdf