Byd: The answer to your query is a Smith & Wesson 4" barrel Model 63!
This pistol IS lightweight - I barely ever notice it on my hip in its Uncle Mike's non-leather holster.
And it does VERY well on Grouse and small game - been using my Model 63's for 4+ decades now with no complaints or failures what so ever.
Plus my first one has way more than doubled in value since I bought it.
Best of luck to you with whichever you choose.
Hold into the wind
VarmintGuy