I have written down in my reloading notes that the .455 MkII maximum pressure is 900 bar according to the CIP rules.
If I had it figured correct, that's a bit more than 13,000 psi.

Their info must be available somewhere on the intronet to confirm it.

It's been a while since I loaded for it.
Green Dot was a good powder. RedDot too.

I also loaded for a couple of Webleys that had been converted to 45acp and wanted to keep the pressures out of the proof range in that cartridge when used in them.
That's where the info came in handy.


Added: Found this article
http://www.rathcoombe.net/sci-tech/classics/webley/webley-mk-vi.html

Scroll down to the 'Load Development & Shooting' section..

Last edited by Kutter; 06/21/13 10:48 PM.