My wife has the Z3 version (4-12 x 50mm BT) of this scope on a bolt action 250 Sav AI and having no parallax adjustment hasn't caused any issues at all. She has shoot several hares at ranges between 300 and 375m with it and a nice 13 pointer at 348m through the neck. It has a slight advantage in low light over the Z5 3.5-18 x 44mm when compared side by side but if I was looking at the Z5 models I would go with the 3.5-18 x 44mm.
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