RE: 7mm Rem Mag Recipe needed
To start with you have only tried a single bullet.Perhaps your gun simply does not like that bullet.Trying others could improve things dramatically.The same goes for the overall length.Try varying it to see if the accuracy changes.You might also find that other powders work better.In short you may simply need to try more variables until you find the right combination.I do hope that you are not mixing federal and remington brass as doing so certainly will not help accuracy.