So shooting a 308w at 500yds moa on the day (2 weekends ago) 2.5 for wind, for the 303brit, 5moa so the problem is what? Frankly if you are poor at wind reading then practice, join a TR/FTR club, shoot every weekend. Blasting a f-ing big magnum at 400yds when you have to pay for it, ammo and carry the damn thing as a cure for your poor wind reading ability is plain silly IMHO.