Your target will make a huge difference. I find that the best target is a Bright White round target such as a desert plate at 100 yards. For closer range check your pantry for cans to use as a template to cut down paper plates or card stock into circles.
I find that it is much easier to center the dot on a bright white target.
On accuracy I would guess that around 3 inches at 100 yards will be a pretty fair group after you get warmed up. I find that I am shooting much better after a few range sessions. About the same results as I get with a scope. I get better the more that I shoot.

Bob R