99.9999999% of ARs will shoot minute of deer, pig, 'yote, etc. if the shooter does her/his job. I prefer a larger round for deer, but .223 will take deer. As others have noted, check minimum caliber requirements for game in your state, if minimum is centerfire in .22 or larger you are ok.
If .23 or larger is required, you could get a 6.5 Grendel, 6.8 SPC or other larger AR15 friendly calibers.
I have a 6.8 SPC, which is the same diameter bullet as the .270 Win. that I put together for deer hunting.