a 223 with premium bullets on a broadside deer 150yd or closer will kill deer all day long if u put ur shot where it counts. Ive killed 8 deer with a 223 so i can vouge for what it can do. I dont feel under gunned when i take my 223 to the field. Just put the shot where it counts and the 223 will kill. I dont care what any of these other fella's say ive seen it first hand. Oh and btw i have never lost a deer shot with my 223 either. Get her a 223 and practice practice practice till shes shooting 1" groups or under which the caliber is deffinately capeable of and she'll kill deer!