It's a sad time, but FYI OSAGE ROOST will be pulling the plug at the end of the month. It's been a great 15 years since the start, but it's hardly ever used now and time to move on!
Ironwood worked well on the Andy Kaiser Ceramic call I used this Spring. I also used a dymondwood striker made by Bill Lyman. I killed my second bird this year with this combo.
Black Locust but then I say that for any surface.