I thought for sure I broke one for sure after 100yds, after a few minutes it started taking more line out(one of the best hunting moments in my life btw). I have yet to break a line (17lb) but I would think it has to do a lot with the layout and the path the game takes. Most have mine have ran strait after shot. I am sure if they run a post route your chances of breakage are better. I am always surprised how how tough that line is. When retrieving I have broken off branches and uprooted small plants when pulling it in.
Not to steal your thread, but has anyone had any success using those fishhooks that attach behind the BH? I have shot 2 with them on and they never detach on entry like they are supposed to. My guess is that the string gets wraped on the shaft durring flight and gets caught on the fletching anyways. This could almost act as an anchor if the hook does stick on entry and you have several wraps around the shaft, the string could then prevent the shaft from passing though. its a nice idea, but I think having the string permently attached arrow is a better way to go. Anyone else have any thoughts on this?