This is a fairly new bullet that was designed by Barnes specifically for the 6.5 Grendel. No one seemed to be able to get their hands on any, but John at Fine Firearms managed to get two boxes for me. THANK YOU John! I loaded up a couple of ladders the other day and finally got to the range. 26.0 grains of Reloder 15 gave a four-shot group of 0.81" and 26.0 grains of IMR 8208 XBR gave me a 0.69" group. Previously, I tried the 100 and 120-grain Barnes TTSX bullets, but could not get them to fly. These 115 TAC-TX's are dynamite with the Grendel!