So, you went to the range and fired less than 20 rounds, total? Usually when I make a trip to a shooting range (I have a 100 yard range back behind my house) I take a shotgun to shoot a round or two of trap, high-power rifle for what I think of as "real" shooting, and then I'll bring a .22 or pistol, for fun practice. It's pretty rare for me to go to the range and fire anything less than 75-100 rounds of various ammo. When I'm at my house, it may be as few as the 4-shot groups I fire when working up loads.