In case you are not familiar with Tom Givens you need to catch up. He runs a very progressive training venue in the Memphis area that focuses on street reality and what skills are needed. He has put together a great article with a synopsis of what 64 of his students have faced when using a gun in defensive circumstances and it is well worth the read. I also highly recommend his book "Fighting Smarter", probably the single best book I have read on the subject of street survival.

http://americanhandgunner.com/when-citizens-fight-back/

Hunt hard, kill clean, waste nothing and offer no apologies.

"In rifle work, group size is of some interest...but it is well to remember that a rifleman does not shoot groups, he shoots shots." Jeff Cooper