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One article I have was in Sport Fishing magazine Sept./Oct 2001. They tested 87 braid and mono 20 pound lines several years ago.  20lb Power Prow tested at 27.1 mean wet strength. An article in Sport Fishing magazine 8/2007 had 20lb Power Pro dry break strength at 36lb.  

In the more recent article 20lb Spiderwire Ultracast broke at 51.6lb

I would think that if the same type of tests were done on 10lb or 50lb lines the results would be close to the same number of lines breaking at a higher test then on the package.   

Article above on breaking strengths of various braided lines from Sport Fishing Magazine - 20lb and 50lb rated braids.

Ken "Beachsnooker" Taylor