Here's a link to the NSRA shop. Click on the BM 2010 picture to see the whole target card.
Ten roundels to be shot at 20 yards. The objective is to punch out the spot in the middle of each roundel without touching the smallest circle at all. If you shoot a 177 pellet then the hole it makes will be gauged out as though you had shot a 22. So even if your 177 hole misses the circle, by the time it's gauged to 22 it might be a 9. If you break the line you get the lower number.