My wife has the Z3 4-12x50mm ballistic turret mounted to her bolt action 250 AI and it has been a very good scope. It gathers a little more light than the Z5 3.5-18x44mm and the ballistic turret tracks well. She has shot hares with this combo out to 350m and neck shot a 13 point Red Stag at 275m. The Z5 version wasn't available when we bought the Z3 and I can only imagine that the Z5 has slightly better glass and coatings.
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