I have been getting perfect bullet holes at my house with my new Ventum 33. Yet at the range I seemed to develop a horrible left tear. What I discovered is that the thicker cardboard material I was shooting through at my house was mimicking perfect holes. When I switched to printer paper I saw the same left tear. I was able to swap the shims around and get a perfect hole. However I thought I should share this. Anyone have any idea on why different mediums would produce different tears?