I shot A doe quartering in yesterday evening right at dark with my PSE Nitro and 100 grain steelheads shot her right where it counts in the left lung and the arrow came out her rear end devastating her insides and I couldnt find my arrow she ran about 50 yards and collapsed.I took this doe stalking on the ground.I just couldnt believe it went in at the lungs and came out here rear.I dont have A problem with penatration with my mechanicals.