Temporary Outdoor Air Rifle Range Construction

Hello. I’m after some advice or a point in the right direction please on how to build / the requirements for the firing point & target holders on a temporary outdoor 6 lane air rifle range (no back stop)?

PAM 21C gives the dimensions for the danger area, target line etc & references the JSP for information on the target holder construction. But the only thing I can see that refers to outdoor ranges in the JSP is the same diagram that is in PAM21C.

Many thanks!