If you’re looking to increase the stopping power of your AR-15, then the 6.5 Grendel from Alexander Arms is an excellent choice. Not only do you get increased muzzle energy, but the Grendel offers you improved long-range capabilities without a massive step-up in felt recoil.
Read more about Hornady Black 6.5 Grendel Ammo Review: here: https://ammo.com/ammo-review/hornady-black-6.5-grendel-review