I don't know, I've never seen the flash come from the back of the cylinder and not the forcing cone area on a revo

Maybe an overcharged reload and the case split?

Wondered the same thing. :confused:

I noticed that as well, and wondered if there might have been a pierced primer. Don't know if it would cause a gas escape of that magnitude or not. Maybe the split case theory is right.

Paul

I though about the primer too...maybe an off center strike and primer popped on one side?

Here's the way I see it
The .gif image is slowed down from actual speed. In reality the flash came from the front of the cylinder at the forcing cone . It just recoiled so fast backwards that the camera makes it appear like it comes from the rear when in fact it did not. Trick of the eye so to speak?
That's my theory. For what it is worth.