Strobe lights, especially the better ones you are using, are fast enough to stop action such as the cartridge falling through the water. Could some be the disturbance of the water distorting the image? Are all strobes firing simultaneously? What happens if just one strobe light is used? Is focus exact on the object once dropped? Camera shutter speed has nothing to do with stopping this action--it's all the strobe light. You just have to chose a shutter speed that allows the strobes to sync properly with your camera.
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