Is there a particular reason that you want an aluminum case? Starlight and Pelican work extremely well and weigh less. It's a toss up between the Starlight and Pelican. The snaps on the Pelican are easier, the Starlight seals tighter and is a bit heavier duty. They actually might be more durable than aluminum anyway as they have a bit of give in them. My Starlight case has been shipped more times than I can remember on planes, and via UPS, and FedEx with some very high end rifles and optics, with never a single issue.
Whatever you go with DEFINITELY ORDER WHEELS ON IT. <<<<<<<<<<<<<<<<<
Weight(they actually weight more), looking for tactical or take down with wheels.
Looking for a Shotgun(taken down) + 3 boxes of ammo