I have an old box of 22's that says "warning range 1 mile"
How good of a shot are you? I can't see stuff a mile away so my hitting it is out. With a decent scope on my Ruger 10/22, I can hit a squirrel, most of the time, at 50 yards...on a good day....maybe.
The effective range is really based on how good a marksman you are , I'm no Alvin York, so I try to get within rock throwing range for a sure shot.
Gary