#505 - 300' - 7 Strand "45 lb" Copper Trolling Line.  Go deep where big fish are with Copper. This seven-strand, 30 & 45-lb, copper line is excellent for trolling various baits. The 30 lb sinks approx. 6 ft for every 10 yards; 45 lb sinks approx. 9' for every 10 yards. That means 300' of 30 lb copper line would be around 60' deep; 300' of 45 lb would be around 90' depending on trolling speed & weight/size of bait. Dia.: 30 lb=.028; 45 lb=.037.