I use the Muellers for the dogs, work very well and repeatable. I have them on a 22-250 and a 204, plus smaller scopes on others. I have some repeatable problems with the APV, minor but no problems on the more expensive types. Anything above about a 20x is subject to mirage effects anyway in my experience [I hunt dogs in Eastern Montanna], get a 4x16 or an 8x25. That is my experience, for what it's worth.
sparky