This is the first deer that I've taken with my .257 Ackley. A rechambered Remington 722 that was in .257 Roberts. It was a one-shot kill at 164 yards with 120 grain Speer Grand Slam. He only went about 35 yards after the hit and the 120 provided a good blood trail with an entrance and exit. I'm not sure if the Grand Slam is the best match with its lower BC for the Ackley but it worked well this time.