Re: Should I be able to cast my 3wt as far as my 5wt?
Grass is better than concrete but water is what fly lines were made to cast on.
The surface of a fly line is pliable and soft. If you have ever gotten a grass cut, you know that if you slide a blade of grass at the right angle it will slice a grove into you skin. The same thing happens with the surface of a fly line. It gets micro cuts on the surface and these cuts can gather small particles of dust and even without dirt, it creates more friction on the rod guides.
If you want to practice on grass, use an old fly line.
"Discovery consists of seeing what everybody has seen and thinking what nobody has thought"..........Szent-Gyorgy