Fluorocarbon line diameter question

[The Rooster]

I was under the impression that fluorocarbon lines were thinner than monofilament for the same pound test. I guess I was wrong. I compared the Berkley Vanish and the Berkley 100% diameter to the Stren mono I'm used to using, and it was smaller for the same size pound test than the Stren was, but when I compared it to the Trilene XL, then I saw that it was the exact same diameter as the XL was for the same pound test.

So now that makes me think I was wrong about fluorocarbon being able to cast better due to smaller diameter but still let me keep the same pound test as before. Cause I was gonna get the 10 pound fluorocarbon to have stronger line, but have it be an 8 pound diameter so it would cast better than 10 pound mono would.

It also sort of explains why the Berkley Trilene XL monofilament was always breaking on me in the 8 pound size when I pulled a knot tight, but the Stren never does. The 8 pound Trilene I used was .010 in diameter and the Stren is .011 for 8 pound. Trilene was thinner!!! I always make sure to wet my line before pulling tight too, so that's not it. With Stren I just don't have that problem though.

Anyway, my question is about fluorocarbon diameters.  Was I just mistaken due to only comparing it to Stren mono, or is it supposed to be generally smaller diameter than mono for the same pound test??  

[Wayne P.]

Just compare the XL with the XT and you will see a diameter difference in the same pound test and the XT will have a higher true breaking strength.