The ballistics put 400 Corbon at the bottom, 10mm above it, and 460 Rowland at the top. .45 Super was somewhere in the middle. Along with the research I started wondering if 460 Rowland wasn't too much for a 1911, although the compensator must help a lot, and I also found that kits are available for the large frame Glock 21. So it might depend on whether you have a spare 1911 or spare Glock 21.

This was the basic data that I found, for approximate comparison purposes:

10mm- 180 grain at 1350 fps
400 corbon- 165 grain at 1300 fps
45ACP +P- 185 grain at 1150 fps
45 super- 185 grain at 1300 fps
460 rowland- 185 grain at 1500 fps

and for comparison BB lists 44 mag 180 grain at 1500 fps

and this:http://www.sixguns.com/tests/tt460r.htm

Only I haven't seen any AA7 in quite a while...