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I've done a lot of remodeling in my house here, rule is to insulate any interior wall I open up. Keeps household noise down, reduces street noise in opposite rooms, and eliminates the eddying air between the studs, making the walls feel warmer. That's definitely going to affect ballistics. I'm using the rock wool batts, they're a pretty tight product.
At what angle to the wall are you shooting through drywall-stud-drywall? Seems most hallway shots are going to be at minimal deflection from the wall course.
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