Here are the shots from tonight (sorry more balloon shots) last ones
I find that moving the trigger further away and reducing the flash output I don't get the double exposures.
1st shot the balloon splitting
2nd Balloon filled with talc (made a bit of a mess in bathroom
)
3rd Just water (sorry about the background I tried foil to reflect light)
4th Water with some washing up liquid (then shaken to make it frothy)
As I don't have a pellet gun like Don
I improvised, I made a paper airplane with a needle taped to the front to make a dart
(you can see it in some of the shots)