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 P220 Stainless Elite 10mm, Ruger LCP, Kahr CM9, GLOCKS- (19 Gen 4, 20SF), Beretta 21A Bobcat, Patriot Ordnance P415, Patriot Ordnance P308, Sig 556 Classic SWAT, Sig M400 11.5", Colt LE6920, 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 design contest rifle, Tikka T3 CTR .308, Winchester 1200, Weatherby Vanguard S2 .223 Varmint & Vanguard S2 .243