I have used the 223 for Antelope and deer a few times with no complaints.
Mule deer past 150 yards is another story. You better turn their switch off upstairs, or sooner or later youll be trying to find one, even if you put the shot through the lungs. Been there, done that. I'm noy saying it can't be done on bigger animals, Any shot to the spine or head will take down all North American game.
You just better be a dang good shooter, and know your limitations. My opinion, MP
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[This message has been edited by Mike Paul (edited 10-26-2001).]