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Yea I think more likely wind as well. Have a look at your ballistic calculator, it wont take much wind at all to push a .308 that distance at 400yds. Correct (dial) for windage and have another...

You'll have to go to a range somewhere and c if you can hit roughly a dinner plate size target at 700yds 1st. Then see how good it groups at that distance. Then practise untill you can do it on a...