Roger Rotharr shot a big bull moose that quite far away and cut off a rib going in and a rib going out.Complete pass through.
Consider this.If the head is making noise,it's behind the head.The noise does not occur until the head cuts the air. By the time the noise is at the animal,the head is in.
If you don't believe it,stand in a safe place,a few feet away from the bale,but exactly beside the bale.See when you hear the arrow.I've done this,the outcome will surprise you.
One more thing,I've only used wooden shafts with the snuffer,so I can't say what they do with other materials.