i think that info was in jims on line seminar. they were talking about snap weights, but im sure one ounce of lead is one ounce of leadIt's been on other posting might want to search, but from what I remeber it is related to speed of trolling example 1 oz weight trolled at 1 mph 50 feet of line out will run a 25 feet down. At 2 mph a 2 oz weight will be the same 50 feet out and 25 feet down. You can probable eyeball to see if line is a 45 degree angle. I am not a expert but this is the way I took the info from other post. Line diameter might have to change it too. my 1.5 cents worth.