A properly set up 1911 and its properly set up magazines, will feed a full magazine of fired, unsized, empty cases. Every 1911 that leaves my shop is set up to do exactly that. They are returned with full magazines of empty brass, for owner testing. If your 1911 fails to feed factory loaded ammo, there is something very wrong with the gun/mag set up. Been doing 1911s for 60+ years. A few of my custom 45 ACP guns.

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“To expect defeat is nine-tenths of defeat itself. It becomes a self-fulfilling prophecy. It is best to plan for all eventualities then believe in success, and only cross the failure bridge if you come to it."
Francis Marion - The Swamp Fox