Can't say how they work on deer, but they shoot just fine out of my Howa 1500 (about 1.5 inch groups) at 100 yards. I took my daughter deer hunting last year, and tried out loads with the 64 grain Winchester, the 60 grain Nosler partitions and the 65 grain Sierra Gamekings, and I believe some 70 grain Remingtons. As usual, the Sierra's were the most accurate (under 1 inch at 100 yards), but the other three kept them around 1.5 inches or a little better. Decided to use the Gamekings, but unfortunately saw no deer. I almost got to try them on a pack of dogs, but they turned away from us at about fifty yards (after they saw me stand and raise the rifle).