Hi Scott,
Happy New Year and a belated Merry Christmas.Yes, I have used the sulky threads (metallic type) in green, brown and black for nymphs. Have not had any problems with durability or breakage, and fortunately I have one of Griffith's elongated bobbins. I recently discovered that there are a couple of other Euro threads in silks as well as metallics. If you are near to a "G Street" fabrics (Rockville/ Gaithersburg area), Hancock fabrics and/or Joann's fabrics you will be blown away at the threads selection. Have fun!
Gerri