Sabot hits can be a problem. I had a sabot from a 200 Shockwave drop into the top of mine and impact the far sensor housing, it knocked a hole into the plastic housing but the sensor still worked (after I removed the peice that landed on top of the internal sensor. When working with it up close, watch for consistency of readings and errors that indicate a false reading. These could be caused by muzzle blast, smoke, separating sabots crossing the first sensor before the bullet gets past the second sensor and probably a few other issues I can't think of right now. Most of the time I place mine out about 5 yards to minimize those problems. I have seen erratic readings with hi power rifles with it around 2 to 3 yards out, once I clocked my 7mm at 5000+ fps with a 140gr bullet, that load usually is only going 3350 so I knew something was wrong. I backed the chrono off to 5 yards and things started reading normal again. Let us know how it is working for you, who knows maybe it will work out OK.