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Jim Watson · February 5, 2021, 10:57 AM

Kind of.
There are three main .455s, according to Ken Waters.
The original Mk I black powder round in a .88" case, the Mk II smokeless in a .76" case.

But US and Canadian .455 put smokeless in the long case and ".455 Eley" Colts are chambered for it.

February 5, 2021, 10:57 AM	#15
Jim Watson Senior Member Join Date: October 25, 2001 Location: Alabama Posts: 18,541	Kind of. There are three main .455s, according to Ken Waters. The original Mk I black powder round in a .88" case, the Mk II smokeless in a .76" case. But US and Canadian .455 put smokeless in the long case and ".455 Eley" Colts are chambered for it.