Nice bear, great pics.
I'd say 550 is pushing it by 200+ pounds.
Here is a 500+ lber sitting on his but in August soybeans from a few years back. Notice how far apart the ears are. Your bear has the short ears that indicate his age is getting there but he just doesn't have that 400-500 lb body yet, give him a few more years and he'll be there when those ears get a couple inches out past his eye then he will be a big bear.
Great pics tho Griz, I enjoy all your shots, I just have a Nikon 600 auto that stays between the seats and I get that lucky shot from time to time.