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I said I would post some sound testing results so here it is. But let me say from the start that I do not claim to be a sound testing expert. Take this info for what it is and please don't bash my results. If you can use this info - great.
I started by testing 220 subsonic loads in my 300Whisper. If I switch from H110 powder to the much faster Winchester 231 powder, I was able to drop the sound by about 3 decibels. When you consider that to double a sound on the decibel scale you need to increase it by 3 dB, I think this is significant.
I was asked if my subsonic 308 loads were the same noise level as my whisper loads. No, the 308 was louder by about 3 to 4 decibels. But it is comparing apples to oranges I believe. If I had the same gun and the same type of barrel, powder etc, the results might be differrent.
unsuppressed 308 subsonic (5744 load) = about 154dB
unsuppressed 308 supersonic (4064 load) = about 166dB
unsuppressed 300 Whisper subsonic (H110 load) =about 151dB
unsuppressed 300Whisper subsonic (W231 load)= about 148dB
unsuppressed 300Whisper supersonic (H110 load) = about 157dB
Please note: I did not shoot tons of each load in an effort to get the most accurate averages possible. I only shot a few of each to get a general idea of the readings.
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