We don't carry that weight merino and I have never woven with it. Can you find out from the company who made it, what their recommended sett is - it's very fine! The other way to test it yourself would be to do a ruler wrap. You can watch Jane demonstrate and talking about choosing your sett in this video in Season 1 - https://www.schoolofweaving.tv/season-1-episode-4-let-s-have-a-little-chat-about-sett