Double Action or Single Action?,,,
In single action a Ruger Single Six is probably the best gun out there,,,
A used Colt Frontier Scout is another good one to consider.
Heritage Arms makes an inexpensive gun,,,
But it's really not comparable to the Ruger or the Colt.
Cimarron makes one called the Plinkerton,,,
Again it's not built to Ruger quality,,,
But it shoots well enough.
In double action S&W Makes the 617,,,
Very nice handgun but it's pricey.
S&W also makes the 317,,,
It's a smaller frame gun but again it's a S&W so it's pricey.
Charter Arms Target Pathfinder is a nice gun,,,
A lady friend of mine owns a 4" version,,,
It's not a S&W but is still very nice,,,
Hers performs very well.
Don't rule out used S&W's though,,,
S&W Model 18 Combat Masterpiece with 4" barrel,,,
Or a S&W Model 17 Masterpiece which has a 6" barrel.
There is strong opinion that they are the finest .22 revolvers ever made,,,
My Model 18 (my 2nd favorite revolver) is an absolute joy to shoot.
Inherently there shouldn't be much difference in accuracy between a 4" and a 6" barrel,,,
But a lot of people like the longer sight radius of a 6" barrel,,,
They believe (probably rightly) that it's more accurate,,,
I personally prefer the balance of a 4" barrel.
Aarond