Unlike lead, light weight Steel pellets loose velocity and energy much faster and do not buck the wind well.
As mentioned in high winds your pattern may shift three feet or MORE..........
One day, shooting the real Heavy shot on ducks in 30 mph winds proved that shots had to be inside 30 yards
in order to score and hit the bird or at least wound it enough to bring it down.
One time I was shooting BB's at geese ten feet off the ground, heading into high winds and I took a shot at the next to last honker in the flight line,with a six foot lead and the goose four foot behind it fell !!
+1 on try to pattern with little or no wind.