Okay I'm not going to start the "you shouldn't hunt deer with a .223" line, but here's a little bit of unrequested advice. 1. be aware that deflection will be more pronounced with the light fast bullet than say a 150grn .308, aim just behind the shoulder as close to broadside as you can get and you should have venison on the ground!
Personal thing here...some like to take headshots with 223/22-250's and whatnot. If you have the skill I guess it's cool, but walking around through the woods and finding a deer that's starved to death from having its jaw shot off is a pretty shitty feeling. JMHO YMMV
P.S. If you shoot a deer wait a few minutes before you go running after it. When I was 14 I didn't listen to that bit of advice and ended up walking a mile or two in a nearly frozen swamp. Twasn't fun at all! LOL