Thanks Draco. I can be hitting a 30mm spinner quite reliably then it all goes wrong. I suspect the eyes rather than the gun and the idea of clamping on a 'scope or red dot doesn't really appeal (do red dots work in daylight at 10m?). More practice would help I think but I am tending towards blaming the equipment and going shopping. I suppose a dot of flouro paint on the foresight might be worth a try.