I get that these are considered the "cheap" option, and some may have a hard budget which I can understand. However if you can go one step in price up, even being budget minded I strongly recommend considering right now Nanuk is still having their sale, and for only $100 more dollars because it is also free shipping and no tax:
Measuring 52” inside, the NANUK 995 is our longest case built for extreme protection and transportation of double rifles, primarily. | Shop Now at Nanuk
nanuk.com
You get a top of the line quality case (imo better than pelican), lifetime warranty, their customer service is great, and the case is slightly larger. Also there are plenty of third party options to change the foam to closed cell (polyethylene) foam if you want.
If you get it with the TSA locks and foam it will put you at $217. Or you could do foam and no TSA locks, then throw in either a shoulder strap, or a dessicant pack and it will be $215. The 985 and 990 are also great deals right now.