Took mine around 150yds. I wouldn't try to take a deer over 200yds with a .223. As it loses energy pretty fast. Anything under that IMO is fine for me.
Didn't get a picture of the deer but here's the spot i was in.
"Combined synergy of a man and rifle is matchless, the steadiness of hand and acuity of vision, and finally the art of knowing how to make the rifle an extension of the body, all equate to the ultimate synthesis of man and machine."
"Death smiles at us all, all a man can do is smile back."