Quote Originally Posted by Shakeyfly View Post
thank you... so as just a further clarification, you can have a 300 grain line in both sinking and floating? Just the diameters would be different to compensate for the displacement and density?
Yes, you can have floating and sinking lines which weigh the same, and it's not just a matter of diameter. Think density. Although a pound of lead and a pound of feathers weigh the same, one floats well, one not at all. That's a little bit of an oversimplification, but line manufacturers know all about density and buoyancy. That's why 30' of one line will float while 30' of another line, weighing the same and having a similar diameter, will sink like a rock.

It's the weight that determines which line will load a particular rod. It's the density which determines its characteristics in the water.