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Should changing the power on a variable power scope change the point of impact?
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No, but sometimes I've seen it also. It has always been with cheaper scopes though and I'm very surprised you're seeing with a Zeiss. How much change are we talking about? And, 257 Weatherby is a barrel warmer, any chance this POI change was due to barrel heat creating mirage?
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Do you have to sight in a variable power scope at the power you expect to hunt with and never change it?
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You should not and if the Zeiss is truly doing what you think I'd call them to discuss an exchange.