Any such thing as sub sonic .410 000 buck?

I know that one of the challenges in sound suppressing shotshell ammo is the multiple supersonic cracks of multiple projectiles. Of course the only way to address that being to use subsonic ammo.

If a 2.5" .410 having 3 or 4 000 buck pellets was loaded subsonic it might be interesting and fun, maybe. I even wonder if less powder might make room for just one more pellet than an ordinary load with 3 or 4? Probably not, but maybe?

TED