Do as you want, however you also obviously choose to ignore the combined experience of people like BCR and others who have actually done it over and over.
Years ago I had doubts. Then I visited here and realized without ever using one on Deer, that If it didn't work for me, the fault would not lie in the fact that it was a .223cal.
The one thing I find perplexing about this place is the often "have you ever done it" reply. I've never shot an Elephant, but if I was going to do so the choice of an appropriate cartridge and caliber would be down on my list. Others have already answered the question for me.
