Mr. 510 said:
While most of what you say is true, remember that a gun tuned for .45Super is still a .45ACP and will shoot it just like any other. My thought here is to shoot .45ACP almost exclusively and even CCW with it. Just swap in a mag of Super when you head for the boonies. No drama, no barrels or springs to swap, just change ammo and go. Seems pretty darned versatile to me!
On the subject of Super brass, Starline stocks it. If you really want to get into it cheap you can cut down .308 Winchester cases. That's what I'm going to do with all the brass my Saiga has mangled beyond use.
From what I've read most quality 1911s can be "modified" to shoot .45Super for about $30 worth of springs and a couple hours at the range. Many people have tuned their guns for it using the "how far does it chuck the brass?" method. Start with a 26# recoil spring and work your way down until the gun chucks Super brass 10-12 feet and ACP brass about 6 feet and I'm told you're good to go. Stick with 185 grn. projectiles and it certainly won't beat up the gun any more than full house 10mm would.
BTW: I'm in the middle of sorting out a .45Super conversion on my XD45C. I think it's going to be a really nice package for urban/woods carry.