Re: muffling gunshots - dampening tunnel?
You must work for the USPS with a handle of express. Oh well, to the post. What I have used for years is simple and cheep and very effective, oh and it is cheep. Wast tires! Free at any tire shop. Get about 2 of size 13" & 2 of size 14" & 2 of size 15" all the way to 17 or 20 inch. Stand them side by side with the largest diameter tires closest to your shooting bench. Place a board (4X4 works great)through the center of the tires and tie a rope to each end and hoist it up using a tree limb, to be level with your shooting bench. You should aline the center of the tires with the target and your bench. Shoot thgough the center of the funnel created by the center of the tires and you will have a very effective muffler.
Hope this will help.
With respect to God and your Country, do as you please.