If you can, have a look during daytime and find out where the warren is and the most used paths in and out of it. When you turn up to shoot try to get there before the bunnies start moving out and get yourself well hidden about 30 yards or so downwind of the likely looking spots and just wait for them to come out. Try to give them time to get a few yards from cover and it can pay you not to shoot at the first one you, as they seem to send the smallest ones out first to check things out.
You should be able to get a couple at least, while you get the hang of it.
It works for me anyway(sometimes)
TX200 Mk3 Pink Calibre, HW99s Blue Calibre
Huntsman MK1 Pink calibre, AAS200 Pink Calibre