I fish 2# test line almost exclusively. I regularly catch smallmouth in the 5-6 pound range. The 2# test line I use the most will test out between 2 and 3 pounds. But I use several lines out of Japan that are rated at 2# test and will test out at a breakage of two pounds. I also have some 1.5# test line out of Japan that will test out at 1.5 pounds. I never dead lift a fish with 2# test line...never....not even an 8 inch bluegill. If one wants to go for a line class record you have to send your line in to the IGFA and let them test it....no matter if the line is stamped "IGFA rated" or not.

Regards