If I had to guess, I'd peg the actual break strength of 30# Fireline at well over 50 pounds.
I use 20# FL with 40# leader on my plugging/light jigging outfits and when I've hung, the leader always breaks first.
Someone did an actual straight pull break test on 14# Fireline, on another website, and found that it broke at 34#s of pull.
The other thing I do to try to make sure the leader breaks first is use a Palomar on the Fireline to the barrel, and a simple clinch on each end of the leader (unless I'm using a loop knot on a jig). One other thing I do is use a 4 turn clinch on the barrel end and a 3 turn clinch on the snap end, to try to make sure it breaks at the snap so I can re-use most of the leader.
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