Think about it, you should be able to figure it out by yourself, but I tell it here for you. When you create anything, it doesn't exist until you have declared it, so you cannot make a grenade gib itself, because the grenade doesn't exist yet when you are declaring the gib to be the explosive. There is a hacky way to get it gib itself, but it's hacky. Look around for it if you are still interested.

10 works all the same.
Calm down, ease off the caps, and realize that's been asked for many times and is not possible.