Handgun sights are a very personal thing for all of us, one type doesn't fit everybody. What works best at the range can be a disaster when hunting. With iron sights you can't shoot any better than you can see, so you have to be able to see the darn thing.
Many times a black rear sight & a black front sight, pointed at a dark deer, standing in the shadows can mean a wounded deer. Practice in hunting conditions & you'll come up with what works best for you.
I always narrow the front sight to 1/10", then come from the factory 1/25", the narrow sight helps you see it better because you have more daylight on each side while looking through the rear sight. I also paint mine white, let it dry & then paint it orange or yellow, for me this really helps. Again, you will have to experiment but don't do it in good light at the local shooting range, do it in the field under low light conditions. A fiber optic front is also a great choice.
Dick