From a purely weight perspective go Swaro Z3. I used my older 3-9X36 at the very edge of shooting light at 400 yards and it worked. If that's not enough the Zeiss Conquest HD5 3-15X42 with RZ600 reticle is very good. The Zeiss would have to be purchased off Ebay or some such as it is discontinued. Lastly the Leupy VX3i's. This is the weight first consideration list and with the StrelokPro ballistic app you can see exactly what hold to use with updated atmospheric conditions.