Idea for water splashes by bullets.
Currently if you shoot a round say a (.303) into the water and then a (20mm) into the water, both splashes are the same height. Shouldn't the lighter round make a smaller splash, and the heavier round make a bigger splash. Its like humans, the small kid jumps off the diving board, does a cannon ball and his splash is small. The larger kid does the same thing, but due to his superior weight, his splash is bigger. (Like Kweassa said, "Little effects, make big effects to the game")