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A silencer doesn't change anything while the bullet's still in the bore
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Are you sure about that?
My basic understanding of a suppressor effect on pressure is:
At some point the bullet passes holes drilled in the barrel. These holes lead into the "can." This extra area in the can significantly increases the volume of the gas, decreasing the pressure. So, once the can allows expansion out of the barrel into the suppressor, the force acting on the bullet is reduced. As a result, the pressure in the barrel is 1/2, 1/4, or even less when the bullet leaves an unsuppressed barrel. The results in the reduced noise level. The end effect is suppressors increase velocity, but not beyond the same length barrel extension. This assumes a closed system such as a bolt gun or automatic, not a revolver, and an "integrally suppressed" gun would reduce velocity.
Now, as far as a revolver. I don't see how it would work as well as a closed system, BUT, if so much pressure is escaping out that gap then how do revolvers work in the first place? If the pressure is staying in then so is the sound. So...
Please give it a try and give us the result.