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Thanks Nick,
Dave Nitsche is the man to ask about high speed photography as he's the master. Mine is more dabbling  , but anyway:
Mine was more luck than anything! Basically it was a case of running my 40D at full frame rate to try and capture it- the reason being my remote shutter release was broke (talk about bad timings!) so I couldn't try and judge it, which would have been more ideal. It took a lot of attempts.
There are several other ways of triggering, 1) Hold the shutter down and hope (not the best) 2) Try and judge the shot on one trigger. DN has got this down to a fine art (much better, particularly if you are well practiced in it. 3) use a trigger, either optical or sonic, although some have made their own trigger. Have a nose through the past WAs and in there somewhere is an image of a bullet going through a bottle. This was triggered by the bullet being fired through two pieces of foil spaced slightly apart: the bullet makes the trigger as it passes through.
The key though is the flash. You need the flash set to manual mode, 1/32 or 1/64: anything slower and it won't freeze the shot. Two or more flashes are ideal as they allow more even lighting.
It can be a mess to clean up, although I cheated slightly by filling the container 3/4 full with bubble wrap and the other 1/4 salt: reduces the mess slightly.
At least it's easier than liquid! Good fun though.
Andy
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