db wrote on Mar 29^th, 2014 at 7:33am:

Kingfisher wrote on Mar 28th, 2014 at 4:40am: Trust me this is some weird stuff. So when everything works to your satisfaction and you go beyond rated/rational limits - where does the wire or whatever break? At the knots or ... what?

I've never broken one at the wire or knot just at the terminal tackle. The way stuff flies apart when it does break while stretched under load is kinda serious. I came away bleeding when the snap broke. That's why safety glasses are a must.
The knot or a defect in your main fishing line should break LONG before one of these leaders.