arent hollow points good enough for home defense?

It is an increase power factor.

Standard Power
+P Faster moving, more kick
+P+ Really fast, lots of kick...

Check your manual to verify that it can take +P, although it shouldnt be a problem

<ul><li><a href="http://en.wikipedia.org/wiki/Overpressure_ammunition">if unsure, check your manual or call the manufacturer.</a></li></ul>