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Buffalo Arms makes cases, which you can bring in through IRunGuns. Loaded ammo, AFAIK, doesn't exist. I have a .455 1911 and a Navy Webley and haven't shot either, unfortunately.
Ditto, not made for at least 50 years.... I reloaded my own... afaik that's the only way your gonna get some unless you want some for a collector display. Most 7 round packets (original ammo) goes for $50-$100 per packet depending on age.