Think of it like being in your car with your bird dogs after giving them a lot of steak trimmings or they found a dead deer.
The one pierced primer I saw had a hole all the way through, so obviously the expanding powder burn gas will blow back through the hole into the action through the firing pin or hammer nose hole. Like the dog, some goes out the front, some goes out the rear. Not very scientific explanation I suppose, but if necessary, I suppose some of us, like me, Flanders or Austin could provide a formula for rate of gas expansion, Bernoulli effect, venturi effect, momentum of ejecta, and other parameters.
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