The big problem is the different ballistics of the two weapons. The 40mm flies much slower than the .50 cal so needs a greater elevation for the same range. Unless firing at very close range (a hundred metres or so) chances are you'll end up with either the .50 hitting the clouds, or 40mm dropping on your toes (so to speak).
The easiest "fix" is to simply fire one or the other and not both simultaneously.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
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