I put the snap weights on the leader just behind the copper. Just got to try to guess how much weight and change it out unless you get a fishhawk td you will never know how deep there running. But a snap weight on the end of a 300 pulled by a tx44 will have lots of vertical movement. They really sink and rise quite a bit on turns. I don't spend enought time out there to get a precise depth on it all but if I think I need deeper it's easy to just add a snap weight. If it fires it's easy to repeat it.