We went to test three loads for the .410 today, when we came to the shooting point the wind was quite serious - easily 40km/h, and probably more.
I could not hit an A4 sheet at 15m, or just barely, with #8 shot @ 1145fps.
Is this common?
I do not think the "shot" was at fault. I also stood in the wind this afternoon and any light gun would have been affected by the gusts. You were shooting at a stationary target, but it might have been better at a moving one.