I don't target Northerns specifically but will always carry a couple "musky killers" and #5 mepps spinners and some larger crankbaits.

Over the years I've been lucky to stumble into 4 northerns at 40" or over. 3 out of the 4 were in shallow weedy bays.  The other was down around 15 feet.  I think in June a person could use bucktails in bays on large lakes like Basswood, Kawnipi, Pooh Bah, Sturgeon, etc. and do real well.

My four big ones came out of Kawnipi, Basswood River, Eddy (in the BW), and McEwen.