andyson: Mick, you use a TM 64. Just ran a quick test with my Ping 64 and its about 50%, full swing, full backspin.
Ok. Definitely get nowhere near 50% even with any roll, so it does seem to be club dependant. Very most I could get was approaching 40%, but the vast majority were a fairly close feet instead of yards, so 33%
Thanks for that one. Hope you repaired the green after you as well ;-)
Mick