Originally Posted by
jeepkid
.280 Ackley.
+1, I tested my 280AI with a 140 gr bullet and 60.0grs of imr 4831 and nosler listed it to get 3222fps which was about 100fps than a 7mm rem mag. The nice thing about the 280AI if you use up, lose your ammo or forget it at home you can use standard 280s. Of course a 280 AI only works if you reload or buy Nosler ammo.