I have a TRG 42 338 and the YHM 338 brake mount can. Fit and finish are good. Sound reduction is surprisingly good. Overall weight makes gun almost neutral balance on bipod, with just a few ounces heavy on the stock end. I will buy a lighter can in the future. I can mostly shoot the combo 1.2MOA or a tad more, out to about 1200. I am no expert shot for sure, but I wonder how much better it would shoot (or I could shoot it) with another can (TBAC or any other with appropriate weight for the light gun) that allows different balance.
I have shot both the Sierra and Sierra SD from Elite Iron on the gun, too. Neither is any heavier than the YHM unit. Sound reduction was better with both, as was recoil reduction. Of course, without a meter, I have nothing objective to report; I don't know if the difference is dB, tone or otherwise.