How do I change the blast radius of an ammunition?

My mod relies on changing the blast radiuses of various explosives and for some reason I seem to be unable to change the indirectHit and indirectHitRange values at all.

For the sake of example, this doesn't seem to work:

class CfgAmmo {
//class Default; didn't seem necessary
//class GrenadeCore; didnt' seem necessary
class GrenadeBase;
class G_40mm_HE;

class G_40mm_HEDP: G_40mm_HE {
	access = 1;
	indirectHitRange = 15;
	indirectHit = 12;

};
};

How do I do it and what did I do wrong?

I want to know too. Especially for myself to execute for "player1" in the debug console.