A HW97k in blu-lam, .20 cal., is a statement. An Hw97k in .177 is a tool for target work. Get the tool for target work. Better trajectory, better pellet choice, pellets in .177cal. easier to get.
Bought myself a .20cal./5mm HW97k blu-lam. The thought of shooting Beeman copper-plated diabolo pellets through my y-rock blu-lam was immensely appealing to my inner reptile brain.