First of all if your shooting a 22 at 250 yards your better than most of us here!
But seriously, first of all I would get a set of 1" Rings for the rifle. Then I would get a decent 1" Tube Scope for it Probably in from straight 6X power to a 3X9 Variable. The inch tube scopes let good light in and they are easier to rapidly acquire the target and see it clearly! There are a few good scopes out there for your application. The ones that comes to mind is Simmons, Tasco and Bushnell. Either of them will do you well on a 10/22. And you can get a good one for under $79.00.