My O-235 had two wooden prop strikes before I got it. One was during landing with the gear up where about 6" was taken off each blade. The tower had told him to go around, which he did, and he wasn't aware of the damage until after engine shut-down. The second occured several years later when his nose gear collapsed after landing. We miked the crank and it showed normal run-put. An O-320 I know of had a hit while taxiing that took off about 5" on a fibreglass-over-wood prop. Again, run-out looked fine. There was no resulting stoppage on any of these. Take this for what it is worth!