Shortest distance your scope will focus at will work good enough. Just remember that if the distance is 33.33 yards, one 1/4 MOA/inch click will move 1/12th inch on the scale. The range is one third of 100 yards and 1/3 of 1/4 is 1/12th.
In other words, don't forget to use grade school math.
US Navy Distinguished Marksman Badge 153
Former USA Palma Team Member
NRA High Power Long Range High Master
NRA Smallbore Prone Master