Sam, good point about shots at skeet. For most of us, some are closer than 21 yards, and standard doubles work OK too. But if you're shooting doubles from the middle stations, the 2nd one can be a good bit farther.

Single pellet breaks . . . I think a lot of us have seen way too many unbroken targets with a hole (or even two) in it to put the adjective "reliable" in front of the phrase "single pellet break". Certainly for 9's, and probably even for 8's.