Everybody wants to conjecture on some uber premium trick bullet.
Not needed with the .223 on average deer.
ANY of the 60gr and above Soft Point bullets will do fine.
I've only killed about 120 deer with .22cf class cartridges, so I've got a good idea of what works. (300+ total, only two so far this year, both with a 20ga slug gun, on shotgun only area).
I have a Rem Mod-7 with 18.5" bbl behind the bed room door in case a deer appears outside. It's loaded with Hornady 60gr Soft (MidwayUSA blems) points over 26.0gr RL15. It's deadly on deer.
Has taken over a dozen since aquired in '03. Excellent trigger, mild report, exquisite accuracy. Fabulous ergonomics. Wears a 4-12 AO scope.
First choice in a deer .22 bullet is the Sierra 65gr GameKing. Never lost a deer with it. Never a second shot. Most are bang-flops. Never a recovered bullet.
Second is the Sierra 63gr ProHunter. My .22-250 has never had but one deer run after hit. It was with a 55gr Remington factory load at 325yds. He made it about 110yds. It usually is fed a 63gr Sierra as it shoots under 1/2" at 100yds. As many as you care to shoot....
Use a 55gr, or Heavier SOFT POINT bullet, and you'll find dead deer, if you put them in a lethal spot.
Just like a .243 with 80gr or heavier bullets.