I've killed a bunch of deer with both the 55 and 60 gr. Hornady's. I can't tell a damn bit of difference between the two. I put one of the 55 grainers through both shoulder blades of a big doe from 80 yards. She dropped in her tracks. Bullet was recovered from just under the hide of the offside shoulder. Mushroomed clear back almost to the base but jacket and core still in one piece. She dropped in her tracks. Have killed many with double lung shots and most go down within 30 - 40 yards. They often exit on broadside shots. No question they do more damage to the lungs than a 170 grain .30-30 bullet, which I have killed many with. The one down side is they tend not to leave a very good blood trail. I have not hesitated to shoot deer with either bullet in the past and will not in the future. A couple of my biggest bucks fell to 55 gr Hornady's.
The only .224 bullets I have gotten much of a blood trail with were the Partitions.
Some pretty heavy trails for a small caliber bullet.
Shot a doe a couple years back with the 55 Hornady in a 22-250 and not a single drop of blood was seen. Only a sample of 1 and I wouldnt hesitate to use it again. Damn fine bullet.
Actually leaning towards the Hornady 60 grain HP as my all around 223 bullet for critters, coyotes and deer.