Jim, subject to correction here, but I thought all single hander lines had very tight weight tolerances.
They do, Fred, for the first 30 feet. But WF fishing lines in the 7,8,9 wt range can have head lengths of around 50 feet - some longer. The SA MED that I fish with on calm days has a head length of over 70 feet. Some of the SA steelhead lines have very long heads as well.
The Cortland tropical Liquid Crystal, for instance, has a head length of 47' from 6wt through 9 wt (inclusive). The 8 wt head weighs 305 gns. Even the compact heads in that series are 42' from 10-12 wts inclusive. But the billfish heads are 30 feet.
From actual measurements on vastly different configuration heads, I generally overhang half the head length (except for the MED
). So that is 70 feet of line with the Crystal.
This is the reason why the CCS database is only good as a reference (for the salt) if you have weighed the actual amount of line out the tip on a long cast. As I said in another post, I like rods (for the salt) that test out by CCS at 2 1/2 to 3 times higher in their ERN column than the line I plan to use on it. But again, that's just me.
There is a discussion about under/over-lining that I just saw that goes hand in hand with this topic. For me, a rod "absoluely requires" underlining if, when going for a long cast within my casting range, the rod starts "mushing out" on the presentation. For the salt, I want a rod more powerful than me during my best cast- but not by much.
That is why I bring the line I want to fish with me when test casting a new rod. In my opinion, people do it backwards. They go by rod "weight rating" and wind up using a line one or two sizes heavier.
To me that makes little sense. Got to get to the Post Office before it closes. Cheers,