Moved the Magnus RR-K to my backup gun. After a 2 day match and a few other outtings, it simply does not perform like a close competitor on the market. The measurable difference between reticle movement between the two is over 1.2-1.4 mils in both vertical and horizontal movement (for example: other braked suppressor has a 0.6 mil rise on a 525 yard target. The Magnus was almost 2 mils on the same target). IMHO, it needs a different brake design with a flat bottom to prevent gas from 'lifting' the gun. (And yes, I ran it 9/3 and 12/6 configuration).
However, it works really well on magnum cartridges. Really, really well... Likely due to the amount of gas produced.
With that said, I'm still waiting for my Ultra 338 RR.