Well, to be completely honest now I'm confused.

Oyeboteb, my expectation was like your experience with your New Service. If your Colt cylinder still has the serial number on the rear face, perhaps the cylinder wasn't shaved/converted at all.

And Muley Gil, I'm baffled by your experience. Your cylinder was shaved and the ACP still went all the way into the chamber. I wonder if since the 455 headspaces on the rim that the Webley's chamber shoulder has a looser tolerance than the Colts or Smiths. It would be interesting to know how far a 455 would drop in with the rim removed.

Thank you both for your test results.

__________________
Jim
S&WCA #819