Have a Tasco World Class 4x on my .250 Savage Ruger Ultralite. One day at the range , about 20 years ago, I just finished sighting in and was retrieving my targets when a gust of wind blew the gun from the rest off the bench and on to the ground. Rechecked the zero and to my surprise it was and is still dead on to this day. The Leupold on the Rem.700 on the bench next to me didn,t fare as well.It ended up in at least three pieces. The next time I saw that guy at the range the 700 had a World Class 3x9x40 in the mounts.