Patrick, I don't know about your formula but as far as weighing the fish at the gill, that might work on a little fish but you shouldn't do it there ona big fish. I use the same 50# digital Berkely scale as GS and it works great. I catch the fish at the bottom jaw. Fairly quick and painless.
Quick measuring with a tape can be done fairly quickly to if you are ready for it and do it right at the beach. If you need to run 50 yards to grab your tape you might as well just turn the fish around without measuring...
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