Bob,
I would stay with Winchester white box, or even better, Winchester 185gr rounds, IF it will feed them. Some will, some won't, since it was designed around hardball. I would avoid Fiocchi as it is a bit hotter than the WWB. NO self defense rounds, or Remington 185gr rounds. If you could find some Cowboy Action ammo, it is always downloaded, and they are now allowing 1911s to be used in some special category. I don't shoot CAS, so I am not up to speed on their categories.
You most likely won't be putting a "ton" of ammo downrange, so you should be fine.
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