Regardless of whether you get a spotting scope or binoculars, I would further suggest that you don't check after every shot. It disrupts your mental "flow" and your grip might change from shot to shot. Better to shoot in batches, such as 5 round groups or a whole magazine, depending on what kind of gun you're using. Also, individual shots matter less than groups. Just focus on good sight picture, grip, trigger pull, for each group, then check how you're doing. Especially if you have an adjustable sight and are trying to zero on the target, it's better to do, for example "1 inch down and 2 inches to the left" based on the centre of a group rather than based on an individual shot.