CH: You may want to consider the Leupold-Gilmore line of red dot sights. I used their LG-1 on my old Ruger MK-I, and a squirrel sticking it's head out it's hole at 50 yards is making a big mistake. At 25 yards using WW Power Point HP's, it will cut one ragged hole that can be covered with a dime using a wrist rest on a sandbag.
Two friends also went this route, and have seen the same results with their MK-III's. They run about $150 in all versions. The LG-1 uses a .5 MOA dot; other size dots are available.
My old MK-I 5.5" bull barrel having it's way with Skippy:
Here's Captqc's mounted on his MK-III Hunter:
No wonder Skippy hates these pistols using these sights:
There are others available, but I like the fact that the Leupold/Gilmore sights do not overpower the handgun, and I'm not really a fan of scopes on handguns, but this one works for me for this application.