I like my 4" GP100 allot.
While I cannot hit (reliably) smallish things at 100yds, I can do pretty well at 50.
If I was going to do more hunting, then I would opt for the longer barrel and scope. (I have a 6" taurus tracker in 22 cal that is a soup can killer at 100yds, it "just" weighs 4lbs though)
Just sort of depends on what you want to do with it as the primary function. I would hunt pigs with my 4", and I can CCW it with a big shirt so...
Just my $.02