i underestimate most fish by at least half a pound relative to their size. i caught a 3.4 in a tourney a while back that i thought for sure was only like 2 and a half. my dad is pretty much dead on with most fish and i don't know how he does it but he's usually within ounces. but ya overestimating on your fish just seems stupid. aim low with your estimations! usually makes you look not so dumb. lol.