I’m not a scientist and I don’t know the “actual” stretch rates of different fluorocarbons; nor do I know how you’d even figure that out. But I do fish an awful lot and it feels like Berkley Trilene 100% Fluorocarbon Line has a little less stretch than some of the other brands I’ve tested. It’s difficult to explain until you fish with it yourself, but it’s almost like you can feel a worm hook “pop” into the roof of the bass’ mouth when you set the hook. Throughout my testing, this line hasn’t required ridiculous hooksets and exaggerate rod movements when trying to drive the hook, especially with the smaller diameters.
This fluorocarbon has really shown itself to be a great option when making long casts that may require long-distance hooksets. When you combine this lack of stretch with the strength we discussed, you get a legitimate workhorse fishing line.