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.
Hk 45C, Hk VP9 9mm, Hk P30S 9mm, Walther PPQ M2 Navy SD 9mm, Walther PPS 9mm, Beretta 21A Bobcat, Spreewerke CYQ P38, Ruger LCP .380, S&W 360 SC .357 Mag, Patriot Ordnance P415, Patriot Ordnance P308, Kel Tec KSG 12ga, Swiss K31 7.5X55, BNZ 42 K98, Mosin Nagant M91/30 1934 Tula, Ruger 10/22 50th anniversary design contest rifle, Tikka T3 CTR