The x5 has a quality turret/reticle tension system. My gunsmith mounted my X5i to a khales k525i and zeroed both to target, reticle moved a smidgen on the swaro, then never moved again next ten rounds. Between every one these shots, the turrets were spun 30 moa from center in all directions. There are 3 scopes he recommends for durability: atacr, nxs, khales k series. The x5i holds up to the same standard. He's had several top level optics not make the cut. This was performed on a sub 10# 300 norma improved pushing 230s hard.