I've gotten much better at distance shooting 15-25 yards. My groups are typically 2-3 inches @ 15 yards and 4+ at 25 yards. With a few fliers. Thanks to the advice I received from the range master I better centered my groups (brought them up from the lower right edge of the 9 ring. The main thing I notice, however, was that my groups weren't any tighter at 7 yards than at 15 yards. It's over twice the distance, but same grouping. Why would I shoot better at a longer distance? Is this normal?