It is getting hard to practice these days but this article might help:  http://www.aardvarkreloading.com/resources/homemadeprimercourse.pdf 

      OK, one of the things that vexes me, to some extent, is trying to identify weapons (like revolvers, lever action rifles, &c.) in movies and television shows,  For instance, I'm watching the movie Virus right now, and saw a top-break revolver.  At first I thought:  Schofield!  But no, the latch was in the wrong place.  So then I thought, well, regular Model 3.  Nope.  So I have to conclude it's a Webley.  Indiana Jones aside, I can't help but see the Webley as an imitation of the Model 3.  Now the Webley-Fosbery is a different matter.  It's a really steampunkish gun!  Nothing like a self-cocking, and self-cycling revolver!  Why doesn't someone put one of THOSE in a movie?

https://www.youtube.com/watch?v=yXzn6VFD9SY