It's also related to hydro-dipping ( duckduckgo.com/?q=hydro-dipping). A material floating on the water coats the projectile as it enters the water.
Who knows to what depth it would be efficacious.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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