.223 Rem deer rifle???

[Big joe]

I was looking around at ammo at Sportsmans Warehouse the other day and ran across a box of .223 Rem. "deer" ammo. I think it was Federal brand. What do you think? Is a .223 Rem. ever a legit deer cartridge? If so, what loading and under what conditions? I'll tell you, I respect the Utah mule deer a little too much to ever squeeze off a .223 Rem round into one! What are your thoughts???