The M27 is a fine pistol, but a little light for .357.
The DA trigger is a consistent, steady pull until the hammer drops. And you only notice the recoil.
Most folks can shoot them DA as well as they can SA. Or nearly so.
The model 27 is made on the large N frame. It is the same frame size as the .44 magnum model 29. It is the heaviest frame S&W made up until those huge 50 calibers.
“The M27 is a fine pistol, but a little light for .357.”
Are you thinking of the Model 19? Model 27 is built off the N-frame same as the Model 29 44 Mag. The 19 was my duty weapons back in the early 70’s when I was with the SO and as much as I like them, long term use of full house loads did tend to leave them rattling. Still have my old 19 but it had to go back to S&W for a little rehab. The L-Frame is a much sturdier pistol for extended use.