I am absolutely guessing but I uspect there that the shot is not providing much back-pressure for the can to catch, so the gasses come through relatively unimpeded, whereas baffles will catch gas off the turbulance at the heel of a normal .22 projectile.
also suspect that gas volume would be about the same between brands, for the same load and velocity
I have seen a few posts on this forum about supressing shotguns so maybe reach out and those peopel have some advice.
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