First you better figure out what twist your barrel is becasue any bullets that are designed for deer hunting will be long and heavy and will require a faster twist rate than the light 40 grain bullets.


Aside from that Federals 55 grain TBBC or 60 grain Nosler partition.

Or from a lesser known company like Connely Precisions 53 grain Barnes TSX or 60 grain Nosler partition.
http://http://www.cpcartridge.com/223rem-V.htm

Precision Crafted Ammo loads a 75 grain Swift Scirocco. http://www.pcammunition.com/pc223rem.html