I had originally purchased the Pelican Case, but it was so heavy I sent them back. And, I am so glad I did!
While the Storm cases were taken over by Pelican; the cases are very different. The most obvious was the weight. The Storm cases are significantly less in weight by over 9 lbs. The IM3300 is the largest case in the lineup; I found myself using it even for my M6 carbine. It gives you more alternatives, such as using it for two guns with their scopes removed. The case can be cut to customize it for anything you want to take to the range, or travel.
While the Pelican is a very hard case with no flex at all; the Storm case protects your investments just as well, with a little flex. The wheels are far superior to the Pelican. The case also has closures on either end, which you will not find on the Pelican, for a total of six.
I use the case to hold my Versa Max with a case for chokes, and tools. if I am going straight to the range, I have room for 100 shells as well. DO NOT store your ammo with your firearm! Manuals I keep on the underside of the upper lid. In another case it leaves me plenty of room for my carbine, with scope, cleaning kit, and magazines. And I still have room left over which I use for my red dot sight. sling, punches, and bipod.
The handles fold down unlike the Pelican cases. They have a cushion which is so much easier on your hands, and using the wheels makes it a breeze rather than carrying a soft bag over your shoulder.
The case ...