Can anyone explain this i had another go at 68yds this evening .
1st group shot on 9x mag 71mm (4shots)
2nd group the same settings 54mm (7shots)


3rd group on 4x 24mm (4 shots)
4th group on 4x 37mm (5 shots )

Now how comes on higher mag the groups are twice the size.
There was a head wind but it was fairly constant.
pellets used Webley Mosquito.