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How much power is actually lost between the cylinder and the barrel when firing a revolver?

I've wondered for some time if a snub was getting the short end of the descriptive stick when its barrel length is listed. I assume there is some power lost in the gap, but I still wonder if, for instance, a 2.5 inch barrel revolver isn't really very close to a 4 inch in reality.

I don't mean to confuse a 4 inch revolver with a 2.5 inch revolver, rather to compare a theoretical 2.5 plus 1.5 inch revolver with at least a 3.5 inch auto - 4 inches minus gap blast loss? (For that matter, the 4 inch auto loses some power to cycling.) I've never read anything about this issue anywhere.

JimL
 

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There is a bit of difference in a revolver's velocity and a pressure test barrel. But,. then, you loose a little on an auto cycling the action, too. Normally, it ain't enough that the BG is going to know the difference. I don't have anything quantified, but I've seen quantified data in magazine article tests.
 
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