Suppressors 338 Arc / 338 Spectre Sound Testing (Decibel results)??

[SABuzzard]

Can anybody point me to testing results for 338 ARC or Spectre. I'm mainly interested in how subsonic loads meter. Ideally compare results between 9mm suppressors and 338 cal suppressors. I can't seem to find anything!

Also interested in hearing personal experience those that have fired subsonic 338 ARC/Spectre and subsonic 300 Blackout. How does 338 perform sound signature wise compared to the 300 BO?

Thanks!!