Tested them on any magnum calibers? Would love to hear about that!
AKA... Want a guinea pig?
Here is a picture of a 300 win mag brake. It is the .308 porting tapered to match the barrel with no wrench flats.
Here is the video showing the flash signature (also on our website.)
Shoot me a PM with what you are looking for. What magnum are you running?
Jared