In my humble opinion I agree with both of the previous comments. I have the leupy 3-15 on my bush rifle and it's a great scope.
As Micky said the 3x is better than 4x as a lower mag and 1x extra at top probably won't be much better except for clarity with improved glass over what you have.
If you prefer a more ' up close and personal ' view at longer ranges a 3-18 as tahr mentioned would probably be a better choice.
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