I have a pie-shaped 5+ acre plot whose tip extends down into the swamp. I have a pistol range there that directs into the edge of the pie into the swamp. Physically I'm shooting down, and the nearest building per google maps is a property at 10 o'clock from that position about 1800 yards up and over some hills. I have a chest-high mound of dirt as a backstop which is safe, but I'd like something more formidable that screams "super-safe" to that little voice in the back of my head that worries about everything. Does anyone have any ideas? I was thinking about mounting some landscaping timbers in an upright manner and finding some way to make it support sand bags. I'm sure there's something better, though... I'm not very intuitive with carpentry and such, but can follow basic directions.