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400yards is perfectly do able any day of the week with factory ammunition in a .308win yip you will need to have worked out the drop,and know the range,but backbone holdover wouldnt be a huge...

if you going somewhere where range will likely be under 150 yards,more likely 50 yards,the winchester 180grn powerpoint bog stndard stuff is the ducks nuts....the 150grn load the same is...