I carry a 1911 .460 Rowland conversion. It can be loaded a bit heavier than the .45 Super. I only load it to 1200 fps with 250 gr bullet since I am usually not in bear country, but it is a great deer load.
If I was going to bear country I would work up a load a bit stronger using a WFN 265 gr hardcast.
There is a spare series 70 laying around and I have looked seriously at buying a 460 Rowland conversion kit. How do you like it?
Do have a source for brass and good reloading data?