To quote myself from a thread in the Club section, this applies to -NRA- ranges:
"Besides there being an 8mm calibre limit for F-Class, there is also a 5000 Joule muzzle energy limit on NRA ranges. This converts to 3805 ft-lbs. This of course rules out anything .338 or bigger, as well as the bigger 7s like the RUM ."
What NZDA or other range owners apply is another matter
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