I would agree with several of the initial responses of 1/2 MOA or better being a "tack driver." However, sometimes I believe it can be subjective considering the type of weapon. Like a 12 gauge slug gun or an open sighted muzzy. My slug gun I consider a great shooter and maybe a "tack driver" if I do my part. Off of a bench at 100 that would be consistantly making one ragged hole that is no bigger than twice the diameter of the slug itself. My muzzy, again I would consider a great shooter but maybe not quite a "tack driver." Powerbelts I can get one ragged hole, but I dont use those anymore. The Hornady GP bullets I can keep at about 1 1/2" groups consistantly from a bench.
