When ky legalized night hunting with rifles, we were limited to a 6.5 or smaller. I built a 6.5 grendel. Still use it to this day. I have buddies I hunt with who jumped on the hornady bandwagon when the arc came out. I have nothing against it, but I've anchored more coyotes at night with the grendel than they have with the arc. If I was to build another since ky recently took caliber restrictions off, inwould go to ar10 lol. For coyotes the harder hitting the better. Anything listed in this thread will kill one at the end of the day. Some are just more forgiving than others