Have never had to return anything but leupold. Both came back still fogging up. Other than that very much of the opinion that most problems having to do with sighting in or keeping scopes zeroed has to do with the rings and bases. Getting them secure and totally relieved of stress can be a challenge . Especially for those who struggle anyway. A good scope mounted stress free does not change internally regardless of what might happen when dropped or jarred using it.
The need to resight a scope in season or every hunting season should not be necessary unless you change ammunition . Part of the reason some scope seem to “settle in” after awhile may have more to do with the stress in the mounting system being gradually relieved by shooting,heating and cooling,and handling.

Last edited by foogle; 03/27/23.

"We are building a dictatorship of relativism which recoqnizes nothing as definitive and whose ultimate goal consists solely of ones own self ego and desires."Cardinal Rathzinger