I've got an Alpen and I used it to spot bullet holes  at 200 yards in the black on a dark rainy morning against a black backstop.  I needed to also see which side of the scoring ring the bullet hit was on so I could consider sighting corrections.   It would spot bullet holes at 300 yards on regular weather days.   I also used a Nikon but it was harder to see which side of the scoring ring the hole was on.