..."thuk"
I've been shooting Port Alberni's big gong at 300 yd. Only trouble is, it's such a thick slab of steel--it must be 3" thick, and so heavy, that it's hard to tell if you hit it or not. 5.56 hits are barely audible; my .308 makes a "thuk" sound...but the thing never moves, so I don't find it all that satisfying (no CLANG! no jumping...).
I'm told Campbell River has an official 600 yd, but I've not tried it yet.
One of my gunbuddies has been working at developing a 1,000 yd shot between two mountains near Alberni, but IDK how that's coming along, as he's been away all summer.
I'm living just north of Nanaimo.
CW