I have 338 Lapua Improved JE Custom Tuned brake.
I wasn't sure what was a Tuned brake mean until I received the muzzle brake. I think it is the brilliant design I ever seen. The side port has different angle in every hole (port). Top view: First port is 90 deg, 2nd hole is about 105 deg, 3rd hole is about 120 deg, so on. It will prevent the blast to the next shooter.
Click my Flickr with three photos.
https://www.flickr.com/photos/33655690@N04/18907445375/in/datetaken/
Thanks for the info. I really like the design of that brake you have.
Have you been happy with the recoil reduction?