I can pour 500 rounds of 50cal into a buff with little effect .
Outside of a hangar, I don't think there is anything in this game that you can pour 500 .50 caliber rounds into with "little effect".
I mean, literally, you are talking
seconds of firing time... unless you're hitting the antenna, I do not believe what you are saying is possible. Like, literally, the game engine would be like "Sir, please. Sir, the plane already disintegrated, please... please sir, stop firing..."
Now, if what you really meant was "I can hose 500 round in the general direction of a bomber well outside of my convergence setting with little effect" I would go for that.