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The headspace in the Model 1917's (Colt and S&W) is about twice that of a .45 Colt caliber revolver because the 1917's were intended to be used with half-moon clips. The .45 Auto Rim has an extra thick rim so it can be used in the 1917's without clips, but a .45 Colt cartridge (assuming the cylinder is reamed for it) will have too much headspace. If the round fires, it will be driven forward, then the back part will be pushed back. Depending on the pressure, the front part might stay where it is, and the cartridge case will be torn apart. Not good, so forget the idea of just reaming out the cylinder and shooting .45 Colt.
Jim
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