My local range rents some kind of cheap 20x scope with tripod, which is adequate to spot .223 holes in the white at 100 yards. These scopes are not adequate to spot .223 holes in dark bullseyes, etc. I'd advise trying one before buying one. At the NRA exhibits and so forth, I've seen optics vendors tape a $bill at some distance from their exhibit, such as to a ceiling beam, and invite you to read the serial number on the bill. You may not get this kind of examination, but in a big-box sporting goods store, you can probably get far enough from an aiming point to determine if a scope's resolution is up to your needs...