reload data 6.5

My friends rifle (6.5 Grendel AR) will not shoot Hornady Black ammo with any consistency. I had the same problem with mine. I’ve been handloading 100 grain Nosler Ballistic tips over 8208 XBR with good success. He wants me to work up a load for his rifle (18” Satern 1-8 barrel) but I am...