Lead Core Line

Lead core is trolling's analog depth computer: a soft dense-metal filament inside a woven sheath that changes color every ten yards, so 'three colors out' is a repeatable depth setting you can shout across the boat. Walleye and trout trollers use it to put unweighted lures into mid-depth bands - no downrigger hardware, just arithmetic: each color out adds roughly 1.5-2 meters of running depth at typical speeds.

What it is

18-45 lb test braided sheath over a dense metal core, sold in 100-yard spools of ten color-coded segments. Fished off larger trolling reels with a leader tied beyond the metal section.

Strengths

Repeatable counted depth with zero extra hardware; gets shallow-diving lures and spoons into the 3-12 m band; the line's sag also acts as a subtle shock absorber; segmented colors make patterns shareable ('fish came on 4 colors').

Weaknesses

Bulky - needs big reel capacity; depth is speed-dependent (faster = shallower, so consistency matters); not castable at all; fighting fish through lead core feels rubbery; leader connections need doing right.

Where it wins

Open-water trolling for walleye, trout and salmon in the mid-depths downriggers overshoot and flatlines can't reach; pulling spoons and small cranks on planer-board programs ('segmented' setups run lead core off boards).

Knots & handling

Strip 15 cm of sheath, break off the exposed metal, and tie the empty sheath to your leader with a double-uni or Willis knot; 10-15 m fluoro or mono leaders standard. Note your speed when you note your colors - the pair defines the depth.

Common mistakes

Assuming color-count = fixed depth while varying speed wildly, skinny reels that can't hold 5 colors plus backing plus leader, and tying knots around the metal core instead of the emptied sheath (it saws itself free).