Most of us started shooting with a BB gun. Now we use rifles to shoot at a target with the center ring (X Ring) the size of a BB.
We shoot 25 shots for score and a perfect score is 250-25X.
Some of our members have gotten very good. Lynn Wood holds the Hunter club record with a 250-24X and Marty Steffan holds the Varmint club record with a score of 250-23X.
Rules can be found at National Benchrest Shooters Association website.