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A high-velocity bullet has a shock wave ahead of it (supersonic) that may fracture a raindrop. I haven't heard of any deflection caused by rain.
I've observed 44 mag handgun bullets in a rainstorm through a spotting scope and they do create a mist trail in heavy rain, but accuracy wasn't precise enough to tell whether there was any deflection.
A few years ago, we held a rimfire benchrest match at 50 yards and saw mist from bullets hitting raindrops though the 36x scope, but didn't notice any deflection. Scores were normal.
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