I am a BIG fan of .357 carbines. Marlin, NEF, T/C, I like them all.
Fox Ridge Outfitters can make you a .357 barrel for either the G2/Contender or the Encore.
Most .38 loads are nice and quiet out of a 20" or longer barrel, but they won't gain much velocity, maybe 10%.
357 Magnum loads will gain up to 25% or more over a 6" revolver and a a pleasure to shoot.
My favorite .357 is my inexpensive little NEF Handi Rifle with a 22" barrel and open sights.