I believe the Terminator is a knock off of the APA line of muzzle brakes. Going from memory Jared has been making and selling them for over ten years now.
I'm considering thinking that these brake tests that "free float" the rifle are a bit bogus when comparing different brake designs.
What would each "feel" like to a person?
What if a strain gage were placed between shoulder and recoil pad? What would that tell ya.
I did the "free float" thing with my 375 Allen Magnum with a large PainKiller brake and a 350 SMK launched at a bit over 3300 FPS.
The rig slid back 14.5 inches.
However when I'm prone behind it movement is maybe an inch and I can spot my shots.
I't kind of satisfying when the big girl speakes with such authority and shoots well at long distances..