I've been amazed at the accuracy you can get when using a peep sight, but like cayugad said they can be hard to see through in low light conditions.
What I like best is a fine fiber optic front sight when using a rear peep sight. The hole is fairly large....I think around .156 dia. I take off the rear peep (aperture) and shoot looking through the taped hole in the early morning and late evening hrs. when the light conditions aren't the best. I think they call this shooting through the ghost ring? It works pretty good...you ought to give it a try.
Keep it in the 10X
mac454