Like all your gear, its one of those things you test prior to going in the field. I shoot a pretty fast bow but 125grain razorback 3's and have only had one messed up shot. It was my fault because I didn't check it out prior. Now I always take a shot with a new spool to make sure everything is cool(Live and learn). Our group has a pretty good success ratio on hit deer because the tracking line.

"Don't Look Em In The Eyes"