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The Ultramarines movie actually spent a good amount of effort figuring this out for bolter weapons. The result is a very specific and yet memorable sound, made up of a compilation of noises, like a clang, a bang, etc. You can watch the movie on Youtube, I think. Just pay attention to the sound the bolter makes, because I think they aced it.

The Tyranid Devourer makes the same sound as a bunch of worms

Lascannons go "FREEM!"