What actually causes a great group to go astray? I've always blamed myself. But it seems to frequent or I just screw up consistently from rifle to rifle! I'm shooting my 270 WSM tonight to see if the barrel is salvageable, pitted leade, was extremely fouled. It's showing some promise. This 3 shot group was 57 grains ofH380 and a 130 grain Berger classic hunter. First 2 shots 1 nice hole, 3rd shot ruined it!