A lot depends on girth, especially when you get over 25#.
A 42" fish can weigh anywhere from low 20s to close to 30 depending on girth.
General rule of thumb:
10 lbs about 29-30"
15# about 34-35"
20# about 38-40"
25# about 42-44"
30# about 43-46"
35# about 45-48"
40# about 46-50"
45# about 47-52"
50# about 48-53".
54" or greater you could probably assume you have your 50# unless it's a real racer.
Girth is the real key---the record fish was 78-1/2 lbs but only 53=1/2" on length.
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