I've got ugly groups (no, not the SF kind)

[Blue]

Alright gentlemen, help a sistah out. Went to the range to qualify the other night, and as usual I shot rather well (96 out of 100), but my grouping is just ugly, ugly, ugly. My shots are scattered all over the 8 and 9 ring, no apparent drifting to the left, right, up, or down. We shoot a SW99 .40 (ugh, I know, I don't have a choice) and was wondering if anyone could recommend any drills when I hit the range on my own time to improve my grouping.

Thanks!