Great round! I have 160 grain Accubonds in front of 59 grains of RL26 moving 3,105fps out of a 24" Bartlein barrel with 1/8.7 twist. I love my .284 cartridges and the .280AI has become my absolute favorite. It is a very efficient cartridge and depending on the rifle, my AI's are outperforming my 7mm RM's with same by 100-200fps with same weight bullets.