Part of the issue is that most if not all modern formed ranges are what they class as 'zero danger area' so that EVERY shot must be contained in the range formation. Any land downstream must be protected from shot, as the range doesn't control it or exclude access. Also, overhead is classed as a hazard area for some ranges as well so the range formations must be made to not promote ricochet or bounce. Part of this comes with 'energy level' calculations, or the maximum caliber allowed to be shot on the range. This is where a lot of the ad hoc ranges fail, and also the boundary capture and exclusion mechanisms. The approvals thing is there for a reason, it might seem a bit counter intuitive but one of the risk areas for these new design ranges is the amount of metal the target butts can soak up before they become a ricochet risk in themselves and need to be turned over with the risk of lead contamination etc etc.
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