You are right that it isn't relevant to the discussion of the legality of Beowulf magazines.
That being said, I don't want someone to get the impression that the Firearms Legal Insurance covers them while they are out target shooting on Crown Land because last time I read the terms and conditions in their entirety, it was pretty clearly that it covers legal hunting, and legal range activities. Plinking on Crown Land doesn't fit into these two categories, so you have to make a choice between having the hunting "t"'s crossed and the "i"'s dotted, or having no insurance when out plinking not on a range.