Me Wud, full rat-tail shafts, from 23/64" to 5/16".
Unfortunately though, I cannot compare then to a 10" tail taper, I did try those years ago but couldn't see much benifit over a parallel shaft for what I was doing with the bow back then. Haven't tried them since, just guess I've never needed to.
Bought my 110# Red Balau full rat-tail shafts on a whim, and very pleased I did. I really like them out of my 75lb longbow at the moment.
Hope someone else chimes in with some comparison info, would be quite interested myself.
Best
Lex