I am getting back into the shooting thing. I have seen ammo listed as +P+.

1) What the heck is this stuff?

2) How do I know if my pistol will handle it?

3) I heard that the +P+ ammo in 9mm makes it rate with a 45 acp. Is this true? This would make a 9 mm very good for self defense wouldn't it?

4) What are your thoughts on the +P+ ammo out there?