Sound deadening material inside shroud?

[Hold_Over]

Anyone tried Mc muffler packing material? Actually design for sound absorption with some heat resistance you don't need in this application.
https://www.amazon.com/Universal-Re...k2sW92sXnQvG1pic-0qZzUlDepRYZZAxoCZ3gQAvD_BwE

 

[Loff]

I have used thin felt sheets.
In one case I built in-shroud moderator for my Snowpeak P35.

In other case, I took Huma-Air moderator (MOD30-3/0 Avalanche) and took it apart. Then wrapped every section internal baffle one half in felt.

In both cases that felt wrapping made big difference for what I can hear with my ears. In that Huma-Air case I do not know that how much did Db-s drop, if any, but it sounds more pleasant to my ears.
That P35 in-shroud mod is super quiet.
Both are in .177cal FAC. That Huma-Air mod. is for AirMaks Krait L.

Snowpeaks original baffle system:

 

[aroundlocks]

Snooker table baize is a felt with high wool content.
So sound absorption is better than cheap nylon type felt.
My quietest mod has curlers and this type of felt
Just my opinion