Point of impact differences at 100y is as a result of barrel vibrations and not bullet drag. If your barrel is touching the stock as in 'not free' floated that could cause stringing. Glass bedding and free floating could help consistency. Did you give the barrel time to cool? If you did not give the barrel time to cool take your time and shoot a 'very' slow 3 shot group and see if it make a difference. I would recommend a good rear bag also.
Last edited by m77; 07/30/18.
