Originally Posted by flyflingerandy
The reason the 6wt worked better than the 5wt, would have to be because all fly rods (except Orvis and Winston WT 2-5wt) are rated for DT lines, not WF. To get the same flex and feel, if it is a 5wt rod, that is a DT5F or WF6F, hence why some rods are labeled 5/6, 4/5, etc. Also, the casting feel is a completely subjective thing. Entirely up to the caster.
I dont suppose you can find a cite for this? Because i am fairly certain that
rods used to be labeled 5/6, 5 wf 6 double tapper. The front of the weight forward weighs less, so the wf weighs. Now since almost everyone uses a a WF rod makers have taken off the second double taper designation.
Their are many reasons why the 6 weight line could work better than the 5 wt. First of all, The faster the rod, the heavier the line the more it will slow the rod down. So if you like a 5 weight that has a action of X, and you get a rod that is a whole weight in action faster, putting a whole weight line faster on it will make it cast better for you. Like if you like a slow action rod and someone gives you a 5 weight xp, putting on a 6 weight line will make it cast better for you.
Lets say you have a standard action rod, you may like the heavier line better because it has a more pronounced load in the road, and helps you know when to stop on your backcast.