I pulled on it "a little harder" and it broke the StaSet probably right where it entered the winch.
I made a video.
http://www.youtube.com/watch?v=WrxrA-4hA30 I can't imagine it needing to be stronger than that. The winch is a Barient 22 so not as powerful as the one on my boat thus the struggling you see as I try and break it. This stuff sure is strong!
The termination on the Amsteel is a brummel splice and it is attached in this video to a padeye with a Soft Shackle that I made.
Unfortunately, I had neglected to put any whipping on the splice and it opened up a bit on the recoil, which I guess is understandable.
Amsteel is a Samson product so not sure about the test splices.
Allen