I think "G" posted this a long time ago as I bought some C55's and tried using them a few years ago. Now if this wasn't "G"O well I am old and forgetful anyway.

CHINA C55 CRANK BAITS DEPTH CHART
10#test line
18ft- 6 ft deep
30ft- 8 ft deep
40ft- 9ft deep
53ft- 13ft deep
75ft-16ftdeep
100 ft- 18ftdeep