Bryan Litz for one. Would be hard to find anyone who has done more documented testing.
They have not been able to replicate OCW or any other type of positive compensation with any confidence. As well as have open invitations to anyone who can bring their rifle and ammo and shoot it over their equipment.
Thus far, no one has been able to show them anything that holds up over time.
Also, while not an engineer (or might be, I don’t know),
@Ledzep constantly posts data here thar is well beyond what most anyone has published that shows what most people think they are seeing is mostly “noise.” Yet everyone just skips right over his posts as they can’t debate them with any research or data.