Only once, and it was may own fault-trying to shoot a 7mm Rem. Mag. 700 BDL from the prone. My younger son got one from a .223 Handi-Rifle. He was seven and insisted on putting his eye about 1/4" from the lens....Grandpa, Dad, and big brother all warned him, but no, he knew what he was doing. The next day, we went to Ft. Davis, (Dad lives in Alpine) and the boys got Kepis- The guide 'complimented him' on his "Red Badge of Courage" He was beaming all day, thinking it was actually a compliment.