^^^^^^^
Congrats on the deer. I havent the chance to use my 223 on deer yet but I did get this brown(black) bear with my Mini 14(bought off a gunnut!). To back you up, yes it works. I used 55 gr Win.Supreme Bal.Tips. Shot placement is key. I spotted him about 1km away and snuck up on him. At 150 yrds, I shot this guy broadside. Went straight through the heart and I found my bullet, nicely mushroomed(surprisingly) under neath the skin on the far side. It pierced through the ribs, destroyed the heart, and through the far ribs and under the skin.
here is the damage to the heart using the 55gr BST.
Sorry for the hijack!!