Fact is high powered rifles penatrate too much. Even with ballistic tips the potential for a through and through is very real. Hell, deer get shot with fragmenting bullets every day that pass clean through them. Plus they still can run 50 yards before dropping.
Key to home defense isn't penatration, it's what is going to but the bad guy on the floor. A .233 doesn't cut it for me. Sure a 16 round clip in the guy and he's done, but remember the deer that ran fifty yard. A know a 55 grain bullet usually isn't putting a 200 lb man down for count before he moves closer to me than I want. Sure, a head shot, but have a buddy thow balling balls at you all day from 15 feet and see if you hit every one.
Give me a big slow moving bullet with mild expansion to put someone down. .45 acp, 40 s&w, #5 12 guage, .44 special, 45 long colt.

