I found this interesting wind chart:
It turns out 350 legend is very sensitive to wind drift. At 300 yards in a 10 MPH wind, the drift is 20.9\”, so at 50 yards it could be close to 3.5\”. Yesterday the wind was closer to 15 mph or more. The wind was opposing my shots completely which could cause a deflection in any direction, so I am not so sure this was a good test. Wednesday I will do the 5 shot groups again due to wind forecast.