Stacking vs Non-Stacking Triggers

[TMan]

Based on DA's remarks in another thread ( handgunforum.proboards.com/index.cgi?board=talking&action=display&thread=3862 ) about stacking vs non-stacking triggers got me thinking. (Alright guys, don't do this )

How do you determine if a revolver is stacking or not? Are there degrees of stacking? What internally is the difference in the revolver that makes it stacking or not.

Thinking back, I think by "stacking" means that the revolver trigger is basically like a 2 stage trigger on a rifle: there is an initial resistance and then a sort of a stop which requires more pressure to cause ignition. I could be wrong, it's happened before.

["DoubleAction"]

..TMan; Have I ever heard of the phrase "Very Sensitive To The Touch" ?

....The Trigger will usually begin stacking as the cylinder locks up, before the Hammer begins it's final stage of falling. With the Python, you can tell the Stacking by the V-Spring as it compresses. On the S&W's, I can tell by timing and feel the cylinder as it locks up with the locking lugs.
The first time that I worked with a single stage, non-stacking, trigger, was a S&W 629, that Jack Weigand had turned into Custom Combat Revolver; It took me about maybe 15 - 30 minutes to overcome the single stage stroke, after that, I was hooked on that trigger.

...For myself; Working with speed, on a two stage stacking trigger, on a double action revolver, is about timing, touch, control, and the smoothness of the trigger.

[MLB]

Aside from the very odd trigger on the P99AS, the most interesting trigger I have is on the P5C. Three distinct stages: a short take-up (that I wish I could eliminate), steady pressure that raises the firing pin up to where the hammer can hit it, and a bit more pressure for the release.