.45 Colt and .45 ACP Revolver

Early .454 Casull loads used .45 Colt cases, back before SAAMI standardization and factory production. For quite a while, .454 ammunition was pretty much a handloading proposition. Some old reloading data references use the .45 Colt case length.

Agreed.

The 454C cartridge I used in my example above was newly manufactured (Hornady) & well after the 454C was SAAMI standardized.

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