Well Bentrod, I can make some recommendations that may help with leaders. I've been fishing for pike for a long time and have caught a few. The best leader material invented to date that I have used is Seaguar Flouro Premier. I use Power Pro braid in both 20 and 30 pounds and trust me, pike will bite it off easily. It all depends how they are biting. One day 4 pound mono will work and the next day you will lose almost every fish using 30 pound braid. As Polish-Newfie stated, usually any fluoro 20 lbs or better will work but expect to lose a few using 20. Personally I use Seaguar 50 and have only had one fish bite it off ever. I've used fluorocarbon since it was first advertised, at least 10 or 15 years ago. Wire leaders are OK if the fish are not turned off by them but there will be days when wire leaders are the kiss of death, especially in pressured fisheries.