Which Leader?

Which fly fishing Leader should I useOften in the cold, full streams of spring we need to fish our nymphs and streamers deeply in order to catch bass and trout in the large streams. I find that using a Scientific Anglers Mastery Sinking Tip III Line or even a Teeny 200 Sinking Head Line a great help. In order for these lines to swim your flies deeply be sure to use a 5 foot leader. 9 foot leaders which work fine with floating lines prevent these sinking lines from pulling your flies deeply.