Some time a go, I was presented with the problem of shipping a nice rifle.
My solution was to go to the lumber yard and buy 2 1x4x8 and some 1/4" plywood. Then I went to an upholstery supply shop and bought a piece of dense 2" thick foam.
I cut the 1 x 4's to appropriate lengths, cut a piece of plywood out of the sheet, and screwed the back onto the side rails.
Then I cut down a piece of foam to fit into the box, and another to match the first one. A bread knife works well to cut the foam.
Put the rifle into the box, cover it with the other piece of foam, and again screw the lid onto the box and you have a nearly undestructable rifle case.
Less money and more fun that buying something that might or might not work.