A Swarovsk with the adj. 20-60X eyepiece will do this pretty easily, but only when set at 40X or above, especially for .223 holes. At this high magnification, the less expensive scopes will either wash out or get too dark to see clearly in every case. You'll also need a real stable tripod to stabilize it for clear viewing.
You can get by with 20X or so with budget scopes, but your target spotters need to fill those holes with orange golf tees or similar, in order to pick them out.