455 colt 455 webley mk11 ammo

Yes.

Originally the Mark I case was loaded with black powder with a 265 grain hollow base lead bullet, for the Webley Mark I revolver introduced in 1887.
In 1894 the Mark I case was loaded with cordite smokeless, for use with Mark II, III revolvers with improved cylinder steel.

The Mark II round was introduced in 1897 with a shorter case to better suit the lesser volume required by cordite, also using a 265 grain bullet.

The .455 Colt is the same, basically, as the .455 Webley Mark I cordite round, and is also known as .455 Eley.

Dominion loaded the .455 Colt into the 1970s.
Fiochi still loads the Mark II round.

There were also Mark III, IV, V, and VI rounds using the Mark II case with different types of bullets.

It's a fairly complicated history, so hopefully I have it basically right. :)
 
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