This group was shot at 50 yards on Saturday 25-7-2015 with my recent order of JSB's, calipers were zeroed at .022 so I could measure to outside edges.
And this 10 shot group was shot about 18months ago at 50m, if there is a problem with the quality of JSB pellets, I am not seeing it here Downunder but maybe our consumption of air rifle pellets is not as great as other parts of the world.