My Ruger SP101 357 magnum, and my Sig P250 in 357 sig. They are loud in the indoor range.
A guy next to me was shooting a Glock 20 with some handloads. That sucker was LOUD! It was actually distracting me while I was shooting. I finally leaned over while he was reloading and asked him what he was shooting over there.
Beretta PX4 Storm INOX 9mm, Beretta Nano 9mm, Ruger 22/45 LITE Cobalt, Springfield XDm 4.5 .45, Ruger LCP .380, 20"Armalite/Rock River AR15, Remington 870 Tactical Magpul, Swiss K31 7.5X55, BNZ 42 K98, Ruger 10/22 50th anniversary design contest rifle