crimsondave, use this link to plug in your numbers if you have a fairly accurate scale and the formula will convert to percentage of WR. Select the species of choice to open the proper document, The alpha and beta numbers are current in these.
Texas Pro Management chart says a 19 inch should weigh 3.89 pounds and a 20 inch 4.59 pounds. They do look a little thin for 6 pounds. I would trust a digital scale a little more I believe. Just my opinion. I agree with southpaw that a 19 inch 6 pounder should look like a football.
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Did you verify your scale? I'm trying to make that look like a 6 on my computer. For a 19 in bass to weigh 6, it would have to be super fat.
I bought a new digital scale. I think my analog scale was a turd. I haven't been able to test it on the bass but going by the large catfish I caught and weighed with the new scale, there's no way those bass were 6 pounds.
Updated, finally landed a good bass with good scales. 20" and 4.62 pounds on the digital scale.