I have some CT too and their 50 wt seems thicker to me than the regular Gutermann cotton 50wt thread that I normally use. However, I have used the CT thread for both piecing and quilting and had no problems or issues with it, so think you will be just fine using it. And I think the higher the thread weight number the thinner the thread, the lower the number the thicker. Hopefully if I have this backwards someone will correct me. Threads can also be 2 ply or 3 ply and that can affect the thickness too and I think CT thread is 3 ply and that may be why it seems thicker.
Last edited by Jeanne S; 03-06-2015 at 08:09 PM.