Question for everyone

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bluechip

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I am building a 'muffler' of sorts to try and dampen the sound of bigger calibers in my indoor range. The box is quite large and has a port the stick the barrel through and a lexan window to sight through with the scope to protect the scope lens from the muzzle blast. The insides of the box is entirely cover with foam acoustic panels. So here is the question. Do you think that placing a piece of lexan/plexiglas/glass in front of the scope will effect the image if it's not perfectly straight? I have tested the idea and know the answer, but I would like to hear from others what their opinions would be BEFORE trying it. Btw, I was wrong about my opinion before I tried it. The idea is to put the glass in front of the scope and move it at different angles while looking through the stationary scope.
 
I dont know about the image but i do know that accoustic foam in a box will maybe last 3 rounds. Been there done that and im talkin about a 3 sided box that was 2' above and to the sides open on each end. You said you tested it but would like to know the answer before you try it so let us know how it works out. I dont suspect it affects the image that close to the scope but i bet the mirage in the box will be extraordinary after the first shot.
 
Oddly a piece of plexiglas moved at different angles in front of the scope doesn't make any difference to the point of aim. I shot fish with a bow and arrow at night as a kid with lights and the surface of the water made a giant difference in point of aim.
 
Some years ago, gun writer Ken Waters wrote up something on his own home-constructed muffler system. I don't recall the details, but you might find something on a Google search. It was published in either RIFLE or HANDLOADER.
 
I've built three under different circumstances....... decommissioned all of them because I just couldn't get out of my mind the image of looking through the scope to see one of the neighbor kids.....

I'll never do another one on ground level, 8ft up in the air, minimum. or indoors as you've stated......in a completely secure environment.

I've used tires, rolls of carpet and fiberglass insulation with chickenwire. The unburnt powder does build up over time if you actually use the thing. I've never had a flash-fire but know of two folks who have. Currently my thought process would be along the lines of RE-DIRECTION of the blast using a series of cheap plywood plates angled downrange. NO plates of stuff to look through and NO soft fuzzy material to collect unburnt powder.

I have no valid opinion re the lexan plate but I will opine (who'd a thunk it!) that just wobbling the lexan around and NOT SEEING THE IMAGE MOVE proves nothing.


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