Keep in mind the wing guns are only 7mm. Think Hurr1. You want to be between 150 and 250 yards when using those. The 50cals are pretty decent, but as stated not as good as US 50cals. The thing with them is that they hit a LOT harder when you fire them closer. Landing hits at 400 is just wasting ammo compared to landing hits at 200.
I set mine to about 250, and I try to get kills inside that range.
It's like flying a Hurr1. You set them in close, where you can actually DO damage, rather than further out where you just "tickle" the enemy.