Samson calls Amsteel a "Class 2 - 12 strand" they call for a bury splice. I doubt that you could do a tuck splice on Amsteel.
http://www.samsonrope.com/index.cfm?page=28
I also like the Brummel as more insurance to help lock things together - Amsteel is easy to splice - remember the whipping even on the Brummel.