Suppressed Grendel's

[Klem]

To answer the ultra question

https://youtu.be/LJsG_NNOiTQ

Interesting video...

Here are his decibel readings in a spreadsheet. He fires five rounds each string and presumably we average the five for a more representative figure we can then use to compare.


I did not hear a reading on two occasions so have left them blank.

What can we conclude from all this? Arguably not a lot given the standard deviation of the strings and the few rounds fired.
Trying to make sense of the different sides the meter was on and given it was not measured and placed at a specific location I don't think we can conclude much, except that there's not a big difference for either side. With the 9" can however there is, and perhaps that's because the longer suppressor being more efficient means the sound coming from the receiver is louder than the muzzle. Running with this theory I might also assume the 5" is less efficient than the 9" and that's why there is no difference in sound on either side of the gun. The meter is placed on the table is picking up the loudest sound being the muzzle, so that's why there appears to be no difference between left or right side. Certainly the 5" can is louder than the 7" and 9" cans, which is what you would expect.

Interesting there is almost no difference in sound reduction between the 7" and 9" suppressors. Also that there was no difference between the two calibres across 30cal and 6.5 for both the 7" and 9". Meaning, a 7" 30cal can is just as quiet as a 9" 6.5mm can. There is a difference however between the calibres on the 5" can.

Pity Ray did not fire a few control rounds with no suppressor on the gun. Regardless, it is good of him to have done this and I appreciate his efforts on what looks like a very cold day.