https://www.nzhuntingandshooting.co.nz/f12/223-deer-64884/
Hope this link works, hundreds of pages of getting it done with a .223.
I’ve shot close to a thousand red/ Fallow deer, and multiples more goats, etc. with a .222 when culling, mostly with a 50-55g Norma or Sako soft point, there are more and better bullet choices now, than what we had in the late 80’s.
I had a great run with the .222, never lost a deer, second shot if they didn’t go straight down, but as a mate pointed out after I bought a .270, “I haven’t seen you belly crawling, threw the scrub since you got a .270”
Can you kill deer with a .223 absolutely.
Should you ?, depends on your ability, the size of the game, the right choice of bullet, and a multitude of other choices.
The .22 centre fires are easy to shoot well, I consider them a precision tool, rather than a generalist’s. take your time, get in close, pick your shot, and let ‘‘em walk if need be,
Back when there were large numbers of Deer cullers in NZ, NZ Forest service, issued ammo,
.270,308. 2 rounds per deer.
.243. 3 rounds per deer.
.222 5 rounds, per deer.
After witch you had to pay for ammo, says it all really,
.222 was used for lots of other shooting, rabbits, wabblies, birds, Hares, goats, that were unpractical with larger rifles.