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.
Walther PPS M2 9mm, Ruger LCP 2, GLOCKS- (19, 34, 29 Gen 4, 20SF), Beretta 21A Bobcat, POF USA P415 14.5", P415 7.25", and P308 14.5", Sig 556 Classic SWAT, Colt LE6920, IWI X95 OD green, Kel Tec KSG, 6.5X55 Swedish Mauser CG 1903 M96/38, 6.5X55 Swedish Mauser CG 1908 M96, Swiss K31 7.5X55, BNZ 42 K98, Ruger 10/22 50th anniversary, Tikka T3 CTR .308, Winchester 1200, Weatherby Vanguard S2 .223 Varmint