I have been playing with a few sub sonic pistol callibers lately, and it seems the larger the caliber the more noise you get, sub sonic or not. Has anyone else noticed this??? I put my aac suppressor on a 9mm and it almost sounds like a co2 air pistol, my 10mm subsonic is louder, and my 45acp is louder yet!!! anyone else ever play around or experimint with different powders and bullet combos and have any luck???