Well some real good advice here for you Chinook, I took a record blackie last year here in NB, 565lbs, with guts out, weighed at DNR on real approved scales, not bathroom ones,lol.
Back home (NFLD) the black bear is a different sub species than the rest of Canada, and can easily weigh up too 650-700 lbs, ive seen it myself, the bears feed on Caribou calves on the calving grounds, as well as moose calves, I once saw a video that Shane Mahoney shot, (He is the chief wildlife biologist for NFLD) of a black bear taking down an Adult cow moose, it was amazing!!
As for rifle choice, whatever is comfortable and you know you can shoot with! I shot mine with a sporter 303, synthetic stock, aircraft alum scope mount and a 6 power Bushnell. The shot was 58 yards from a 39 foot portable tree stand, 1 shot the bear ran maybe 50 yards to the brush, and that was it, when we opened him up, there was no heart there, just chunks.
Have fun Chinook, the Northern Pen is amazing that time of year, I should be up in area 2 myself, filling my either ### tag, around the same time as you go up there, lots, I mean lots of gut piles on the old logging roads to watch. Have fun man
PS ill shoot ya a pm, for that info about the HLC guy, thanks
Ryan, oh by the way im 6"1 285, for comparison, look at the size of this guys head, measured 21 5/16 boone and crockett