Thanks, GhostTracker.
Those are some great ideas. I'm concerned that--one neighbor in particular--is too close, and in the direction, generally, that I'd be most concerned about. I'd answered your previous posts in detail--but they vanished, not sure how---anyway, your ideas got me thinking of my basement room. It's a low ceiling 12x12, but it has a cupboard style door, about chest high, that leads to dirt crawl space---another 12 to 15 feet, tapering up to where the cabin is footed into the hillside. Still, I don't know how much sound projects forward (the crawl space is only semi closed in, with gaps; also, the bsmt room is just 2x4 with 1/4" paneling. That's why I kinda liked the tire contraption. Not much fun, but at least I could maybe put a few hundred rounds through the gun to properly break it in, and become more familiar with handling it. It's do-able, but I gotta think on it. Your ideas have moved that thinkin' ahead considerably! Thanks again. Bill