I had a Safari Arms 1911 barrel. It would not accept reformed .45 ACP brass as the neck was too tight; I had to use Corbon's brass, which was readily available. At the time Corbon had also switched to small primers, as the std .45 ACP firing pins caused problems with warmer loads. I have not looked recently, but at one time Corbon had pretty good info about reloading the .400 CB on their site.
To get bullets to not set back in feeding, I had to reduce the expander plug diameter, then tumble after sizing to remove all traces of lube, then apply a heavy taper crimp to the bullets. If you have channelured bullets or a channelure tool to apply it to bullets, that's probably the best solution.
I found it worked very well with reduced loads. Subsonic 135's had very mild recoil, and functioned reliably in my Colt. If you have a recoil sensitive shooter at the range, swap in the .400 CB barrel and make the .45 easier to handle.
