Have a Ruger sp101 and it makes for a good option.
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I carry a S&W 329PD in .44 Mag with a 4" barrel. Its their ultralight version, with scandium frame and titanium cylinder. Lighter than a .357 with more punch. I shoot Buffalo Bore 305gr core cast bullets, which will put the hurt on anything. It bucks, but not designed to be a gun you shoot all day every day at the range. It is a great backcountry carry option.
The OP wants the option of birdshot. Not sure if it's even made in any semiauto cartridges. Seems like there would be a cycling issue. mtmuley