All I have been shooting in my 280AI since I built it on a Winchester Model 70 Classic Sporter rifle has been 140 gr. Nosler Partitions and Accubonds. Both have performed superbly in my rifle and shoot very well. I used 140 gr. Accubonds when I was blessed to go on a guided hunt in Alaska in 2019. The bullet worked as it should and one shot I had my bear. Besides my grizzly bear I have shot antelope, mule deer, and elk with my 280AI. Both the Partition and the Accubond have performed extremely well. I'm mostly shooting the Accubond though now. I just like it.