I need help from a 300 BO reloader

[CabezaBlanca]

Have you shot them over a chronograph? It sounds like they are supersonic.

I have not. I'm pretty sure there is an issue with the suppressor. I have shot 3 different manufacturers of subsonic ammo in temperatures ranging from ~45° - ~85°. Not one of the rounds sounded even remotely quite. Not close to a bullwhip as mentioned above. There is a lot of "boom" going on. There is not a cracking sound.