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Old February 9, 2021, 11:39 AM   #21
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 40,861
The Eley/Webley round had a rim thickness of .039, while the .45 Colt had a rim thickness of .060.

Additionally, the width of the .45 Colt round as was slightly greater, so some counterboring would generally have been necessary unless it was a sloppy fit to begin with.

What's interesting is that the picture of the chambers appear to show the original chamber shoulder as a very faint line just before the current shoulder.

My guess is that your revolver did originally have shoulder chambers and wasn't bored straight through.
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