Apparently, you have never shot a revolver. Considering the charge in the round itself isn't used to push the action back on a revolver (since it has nothing but a trigger, resetting mechanism, and the cylinder mechanism), it has much more substantial kick than any other Semi-auto handgun. This is disregarding large caliber semi-auto handguns. In short, you can't fire a .357 like you could in COD: Black Ops.
And this is using a double-action. Single action will take slightly longer.
Single action is where you have to manually pull the hammer back.
Double action is where you "push" the action with the trigger
You fire as fast as you pull a trigger.
Well kinda like BF3, most handguns fire very fast while the magnum is slower firing, regardless of how fast the player pulls the trigger. I've used a real Magnum, a little bit heavy depending on barrel and it jams sometimes.
How does a revolver jam?
(if it isn't a revolver)
If it is the .45 ~ .50 pistols, then it doesn't have anything to do with my post.
The reason that games have magnums that fire slow, is to nerf them.