I run the Hornady brass, loaded with RL17, 140gr ELD, federal 210m primers. I get great results. I run this in three different rifles with the same result. This is one of the targets. And the rifle it was shot with.
I have a 700 LRH in .300 win mag. I am very please with the accuracy as it is a half MOA. I have it topped with a Nightforce NSX on Nightforce 20 MOA rail and rings I shoot a Berger 185 VLD at 2850. This is a very capable combination past 600 on mammals, and 1000 on steel. I did change the...
One thing you might also look at is the amount of pressure you are putting to the loading press. I was having an issue much like yours and found the pressure I was applying was not a constant. One I paid attention to this, the consistency increased. Best of luck.