Be more concerned with retrieval speed (you can even let the bait land on lake bottom ) a count of 4 to make one complete turn of the handle . next time 6, next 8 , ect . easier to duplicate . You can say a ft. drop per second (even though it want always fall that fast)rather than hitting the bottom . Being able to consistently measure is way important than how deep the jig actually is . In comparison pulling cranks someone may say to put out 80 ft. of line . bait , rod tip above water , line size all change depth running . A means of measurement is the main thing . Being able to vary will allow you to fish the whole water column:twocents .