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I use an HTG suppressor. It is little known and relatively new on the market but compares better than some of the more popular models for its noise reduction quality.
Funny you should mention maximum quiet and precision. Those are my two primary objectives too! Yes, the less powder volume you burn the quieter things can be. But there are some limitations. My 308 is a 23 inch, 1:8 twist, Virgin Valley Encore barrel. And yes the faster light charges do produce less muzzleblast and noise. But I have not seen a huge deal of difference in noise between 5477 and the faster pistol powders out of the 23 inch barrel. Your shorter barrel might make more of a difference.
In my 16 inch 300 Whisper Contender barrel, there is a very noticeable difference in noise when comparing H110 with Winchester 231 in subsonic loads. Even with no suppressor installed, I can still hear quiet a difference between the two. I have access to some expensive precision sound testing equipment and am trying to test this out this weekend if I can meet up with the guy that has it. If I do, I'll post the results here.
The last time I tested my 300 Whisper with sound testing equipment, I brought along my RWS pellet gun. The pellet gun registered in the 113 to 115 decible range. My suppressed Whisper (using H110 powder) was very close to that. With these new 231 loads I have been trying, I fully expect the noise to actually register below the sound signature of my spring piston pellet gun. Like I said, I'll post these and the sound results of the 308 sub loads as soon as I can get this tested.
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