After 500 rounds and 8 different bullet and powder combinations trying to fine tune loads for a one hole group, I installed the Cortina unit and after moving the tuner dial from zero to 2.5 I shot this group. I ran out of time so I am going back to the range to see if it will shrink some more and if its repeatable. Up until I installed the tuner I could only get 3/4 moa out of this rifle with this load or any load for that matter. The rifle is a Ruger american in 308 installed in a boyds stock with a matthews cheek rest and a 4x14 power leupold. Brass is 3x fired Lapua, 42.0g benchmark, CCI BR primer and a 155 barnes match burner set at .095" CBTO.
I am now a believer.