Obie...Im with John, especially with todays bullets, killing deer with a .223 is a slam dunk...
Back in the day I trained a couple step kids to shoot and hunt. They each got a .223 and the best bullets I could find for the day. They were made to practice from position and by their first season they were almost-not-quite- sick of their rifles.
End result- each killed their first 3 deer with one shot apiece.
Its even easier now...
"...the left considers you vermin, and they'll kill you given the chance..." Bristoe