I am tring to do load development for a 300 win. Had planned to shoot the bigger bullets with it. Ladder test narrowed it down to 74.5 gr of rl 22. Legth is not touching or anywhere near the lands with the 208 amaxes but 190 smks are seated snug in the lands. This thing is absolutly crazy. It will shoot the 1st two almost touching with the 208s and touching with the 190 smks and then throw the next one. Everytime? I thought it could have been mechanical. Checked everything and it is all tight. Traded scopes still the same deal. The barrel is a Rock 5r but is very light. Could it be heating after the 2nd shot? Tomorrow I am going to shoot two then let it get stone cold then come back and shoot two again and see what happens. What are your thoughts?