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.
The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
Today, we need a nation of Minutemen, citizens who are not only prepared to take arms, but citizens who regard the preservation of freedom as the basic purpose of their daily life and who are willing to consciously work and sacrifice for that freedom."
-- John F. Kennedy