The idea that you could make a .3 inch diameter tube and run it 100 yards in a decent rainstorm it isn't going to be hit by rain almost constantly seems absurd to me. No way for 5-600 yards.
Even if there is a compressed air "shield" around the bullet, when that "shield" hits a incompressible heavier than air water droplet the air compression in that area will increase. This will result in a force against the bullet. So, even with the compressed air buffer, I think there will still be a force on the bullet. Probably reduced.
Given the period of time the effect will be present, milliseconds at most, the effect is likely negligible up until the bullet drops through the sound barrier. At that point the turbulence from passing the sound barrier probably makes the water droplet effects irrelevant. A bullet that is subsonic to begin with isn't going to be shot at that long of a range.
No matter the science, the consensus seems to be the effect is negligible.
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