I have used the Excite bb's, and they do behave a lot like steel bb's in the handling, not much 'squasage' in loading etc. I have never tried the Gamo bb's, but have heard that the Dan Wesson 2.5" smooth bore likes them, so I am going to get some to try in mine. Presumably any of the shell-loading revolvers would be happy with them, someone with a Mk VI Webley might be able to relate their experiences.
A jolly good WW2 era pistol to try out!

Just clocked that you are in Long Eaton, which club do you shoot at?

Cheers, Mark.