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"Factory calibrated turrets" are a wee bit of a sales gimmick.
You would in my opinion be better off with a MOA turret and ballistic software on a smart phone which will work for any load as long...

If you are on Stewart Island then maybe 2-12 something might be best that would give you a good low power for bush hunting, I have a 4-14 and 4x is a bit much in the bush