Yawn, the .45 ACP is, of course, a fine defensive cartridge but shooting two rounds at once doesn't change its role in life.
Now you have something that is bulkier than a .500 S&W and even shooting twice at a time, far less powerful and the .500 is NOT a good ccw firearm in my opinion (I have two of them).
Truly an answer to a question that no one should have asked and if asked, should have been ignored.
Wish moderators would kill subsequent threads on this albatross. Don