I have Bushnell Banner 4-12x40 AO (~$100) on a Handi 223 that I would use on a coyote up to 250 yds.
And a Leupold 6-18x40 AO with varmint reticle (~$500) on a Ruger 1-V 22-250 that I would use on a crow up to 300 yards if it was a safe shot.
Both are fine for their intended purposes.
You might check the GBO Optics Classifieds from time to time. If your putting it on an older gun, going used would get you a higher quality scope at a reasonable price. You can check the "notify" button on that forum and it will send you an email when something is posted.
Also I read about a lot of folks who are very please with Nikon.
Get the adjustable objective for sure, and mil-dots if you can find it.