Long gun Holosun sights have been bench tested to 1000G and pistol type optics are tested to 5000G. There are numerous tables online that show the recoil of various calibers. The recoil the optic experiences can be affected by many factors. A semi-automatic vs a bolt action will experience different recoil. The weight of the firearm also affects the G forces experienced by the optic.  Please see this page for further explaination.