Mike Irwin
Staff
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.
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.