Like this. Purple flower, three trees to the left of the red one.

[Garrus finds it in his scope and fires, a quick, smooth action born of decades of practice. The flower bursts into petal fragments and he lowers his gun.]

Different sizes and types of rounds do different types of damage, though part of the gun's effect is in the head. Means if you're up against someone who knows what a gun is, you can shoot them anywhere and do more damage because they figure they're gonna get pretty badly hurt. When it's someone or something not familiar with a gun, you've gotta be more precise. Forehead, vital organs, throat. Those are the shots that'll take them out. Everything else just hurts.