It's probably better to go slow and carefully, taking it down a ring at a time. With that said, I usually take a hammer and chisel to the end of the stave right above the target ring to get it started, then attack it with a draw knife and peel off bark, sapwood, and the whole pile of rings at once. I pry under the wood and rip pieces two feet long off if I can as I go down the stave. I do occasionally gouge the target ring around a knot or something, if so, then I just take it down to the next one. Beats spending hours chasing a ring.