I been running a grendel for about 5 years now. It’s a great whitetail and coyote round. I’ve always used the 123gr class bullets with either h335 or 8208. I had Shot it as far as 700 yards when I was messing with it more a year or two ago. I started Shooting PRS and kinda laid it down but I’m wanting to do a little load work up for it and really start to stretch it’s legs. Build spec are seekins sp223 upper abs lower seekins v2 mod rail, JpEnterprises match 22” Barrel with their gas block and tube and muzzle break, fail zero bcg, and Geisel high speed national match trigger. Great hunting rig pretty good for accuracy and steel.