Has the rifle shot properly prior to this new load development and bout of shooting?
Are you doing the shooting or is he?
How many groups have shown this pattern? How clearly is it shown? What I mean is, are you seeing a pattern, or are you looking at random results and ''seeing'' this pattern; ie, maybe its a crap load and your seeing patterns in random results.
Try the cold bore group.
But also, make sure to get into the same position after each shot, if the butt is not into the shoulder the same height each time, and if the rifle is working its way back off its rest it can have a similiar effect, if you are getting beaten back by recoil and not getting into position properly each time.
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