Yes, Webley made a number of .45 Caliber Revolvers. Most of them were in .445 Webley. The one you're thinking of is a Webley Fosbery. That was a Semiautomatic Revolver and the later famous Mateba series used a similar design.
Not all DA Revolvers were quick to reload. The Colt 1877 and 1878 for example had side loading gates like the 1873 design.
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