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.
Sig Trailside .22lr, Springfield XDm 9mm 3.8, Springfield XDm .45 4.5, Ruger LCP, Kahr PM40, 20"Armalite/Rock River AR15, Remington 870 Tactical Magpul, Swiss K31 7.5X55