It is not recommended to practice hard pen calligraphy with grooved copybooks. The groove is that your pen tip passively follows the grain and has no independent thinking of its own. Yes, practicing calligraphy is not only about drawing shapes, but also about thinking, so that we can have a deeper understanding of font structure and make faster progress. There is a saying in calligraphy: tracing can learn lines, and copying can learn spirit. Both should be considered.
Therefore, it is suggested that you can trace the copybook first, then copy it next to it, and finally you can master it.
Hope to adopt!