Best .223 bullet for deer?

[petey]

Actually my go to round in this gun is the 55 gr Nosler BT. It's taken numerous groundhogs, coyotes and a couple deer with some well placed shots. I want something a littler stouter. Where I'll have us set up, the shots are going to be more like archery shots, so the boy is well capable.

Opinions...well not really. I kind of wanted real life scientific information, if there is any. I know I'm not the only one that is using this round for deer. If no real life experiences, then I'll take some sound advice on what I should be pushing down the barrel. Oh yeah, a 150-180lb deer is a bigun' in my neck of the woods.

As far as the comment on "if they get away"....that's not how I work...and is my reason for asking the question in the first place. I want a bullet that won't fail on well placed shots. If he doesn't have the opportunity at such a shot, he won't be taking it...that's a gaurentee.