Finn
I read that article closely, and then clipped it to store it in my vintage "file" literally.....an old file folder box. Still have it (article). Aagard was the real deal......and his writing was always authorative and down to earth, based on his experience and use with little to no speculation.
I watched bamaboy as a lad, kill his first two whitetails cleanly with a .223 bolt rifle, Federal factory 55 gr Tactical Bonded" ammo (not sure whose slug), hit just right through the lungs. One bullet exited and the deer bled like a stuck pig, and ran about as far as any other deer might, 50 yds or so as I recall. The other went only about 30 yds, the bullet did not exit, but the deer did not bleed hardly a drop. We moved to heavier rifles as soon as he aged just a wee bit. Thus it can be done.....but their are better rounds for the job.
I have some of the 60gr Nosler Partitions, their short blunt profile is intended to let them stabilize in rifles with the slower twist rates,and what little work I have done with them seems to prove that out. Our YZ Mini Mauser, with its slow 1-12" twist, does pretty well with them. That'd be the route I would go.......but I'm not inclined to take a whitetail w/ .223.