Depends on what range your average shot is, or at what range you prefer to sight in. Until I see the ballistics Im just assuming a sub sonic 185 gn projectile may be dropping rather rapidly so a 50 metre zero might be more suitable. Or if youre comfortable with your rifle sighted at 100 and know where its at for 50, then stay at 100.
Just had a quick look at some charts - sighted in for 100 metres its approx 11cm high at 50. Personally I'd be sighting in at 100 and just aiming approx 10cm low at 50, easy to remember. Then it drops 38 cm at 150 mteres which is 2.5mil, and 104 cm low at 200, which is 5.2mil.
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