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Old December 27, 2012, 11:23 AM   #10
Rainbow Demon
Senior Member
Join Date: September 27, 2012
Posts: 397
The British also had a few autoloaders chambered for the British .455 auto cartridge.
This cartridge was basically the same as the original prototype .45 ACP cartridge which used a slightly shorter bullet with hemispherical round nose.
The longer nose of the U S .45 ACP milspec bullet as we know it may be why the feed ramp of the 1911 undercuts the chamber leaving the casehead partly unsupported.

Not many .455 auto pistols were built, some of a Webley design and a very few Colt 1911 contract pistols marked as such but likely no different than the standard 1911.
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