Today's hard-pen calligraphy "home" is also a dime a dozen. Ren Ping, at present, most of the running scripts in the computer are his words, which are standardized but rigid; Li Fangming, there are many copybooks, mostly for students; Pang Zhonghua's word, called crab body, is too personal, so don't practice; Although Si Mayan wrote a copybook for students, it was basically misunderstood and misspelled.
If you write hard, you can consider Tian Yingzhang's words, but he was a full-time certificate writer in the State Council, and his European sports skills are second to none in China at present. At the same time, his running script (especially hard pen) is very standardized and has traditional kung fu. He published hard-pen CDs and many copybooks. Search online. Also, if you really like hard-pen calligraphy, you might as well subscribe to a magazine called China Hard-pen Calligraphy, which will introduce many good teachers and copybooks.