I feel like every deer rifle needs a scope. And if you plan to hunt with it, scope it. You may be able to shoot accurately with open sights, but a good, sighted in scope will always help you make better shots. It will never impact you negatively. If it's not going to be hunted with, it go with good open sights. Yes, I know hundreds of thousands have deer have been successfully taken with open sights 30-30s. I'm just saying a good, sighted in scope will always improve your accuracy.
The very atmosphere of firearms anywhere and everywhere restrains evil interference. -George Washington