Im looking to buy a 300blk upper soon, and want feedback on experience using subs through a 9mm silencer.

I have a rev9 right now, and no 308 silencer. My main concern is that the reduced volume of 9mm silencers will make them significantly louder, but on the other hand, i dont think the gas volume from a 300sub load is much more than a 9mm.

Thoughts?