With a high quality scope such as a Luep V3 or Nightforce is it usually easy to see a one inch white square (or vice versa) on a black center at 1000 yds. Sometimes mirage is really bad and you are not really certain what you see but most times you can see it. The same scope that can see that dot can see a half inch diameter and 3 inch long spike on a yearling deer at that range. High quality optical glass is important for hunting
It is also important to make sure you have the eyepiece focus ring set correctly.
Hitting such a little dot is something different as Eddie mentions. It is usually easy to get the rifle still and get the trigger broke well. Reading wind and mirage, getting consistent position on the rifle, getting high quality ammo in the chamber are challenges.
Also it helps if you have a rifle that shoots well.
Finally and most importantly, you need to find some place to practice. It is much like a basketball game, you need to practice your free throws is you want to make them when it counts
The Smokin Fur Rifle Club