Steve Ev,
My 9 x 25 Dillon project has been an on again, off again project for a couple of years. I had two .38 Super barrels rechambered (I own the chamber reamer), but the gunsmiths that did them screwed them both up. One came out with too large a diameter, since he used the reamer by hand, and the other smith did it on a lathe, but went too deep with the reamer and that didn't leave enough case neck for the round to work. I've got an extra Nowlin 9 x 23 barrel, and when I get my lathe set up, I'll do the rechambering myself. It won't be anytime soon, but I still hope to get it done.
I have the .400 Cor-Bon on a 1911 and like it, too.
Fred