To be honest, when Brian @ Shoot-Long told me that I didn't need a bore sized brake, I was skeptical. In fact, I held off for nearly a month. It went against everything the industry tells consumers. There was a thread on another forum discussing that very subject. I reached out to Greg to inquire about ordering a brake matched to the bore size of the bore. A few emails were exchanged and he eventually found the video and sent the link to me, to say I was surprised was an understatement. I ordered 2 of the T2 brakes and they are on the way now. They are the only brake I will run in the future.
I run a T1 on a 6.5 PRC and it flat works, that skinny barrel lightweight rifle is a pussy cat now. It was unbearable before at the bench with the Berger 156gr EOLs.
I am going to have another skinny barrel rifle chopped and threaded 1/2-28 so I can run the T1 on it. It's currently threaded 5/8-24.