If the question is, "Is a 3/8" 100 yd. group possible?", then I have to answer "yes," as I've seen such a target in Bill Monell's shop (http://www.manta.com/c/mm2gtn3/monell-custom-guns). If, on the other hand, you're asking whether Dave Scovill actually fired such a group, I must confess I have no idea, but I'm not so cynical as to doubt him.