Defensive? Reloading very unlikely to be necessary. More than 5 shots fired? Likely you are going to jail regardless of circumstance.
Discussion
if you really want to be defensive (here is my more than twenty years of defensive martial art experience) you put signs on your property in plain view that state TRESPASSERS WILL BE SHOT
and then you store your handgun somewhere safe that only you can access
and/or you get one of these ;)