I will defer to jgcoastie,he is there,and obviously has far more experience than I do.
I only had one bear experience ,it was at the junction of the Yukon and Nowitna rivers.The bear put his paws down on my ex-wife,and took a bite through the side of the tent.Very small,4 lb tent.I unzipped the door,and for some reason whacked him across the face with my Win 97 I know,probably not the smartest move.I hadn't had coffee yet.
She was hurt and we were 200 mi from the nearest road.The whack did back there bear off for a bit,but then he just fixed a look on me and was slowly easing toward me.Firing a shot in the air produced absolutely no reaction,not a blink.
My sight was just a bead,and I was loaded with the standard lead forster 1 oz slugs,Feds I think.I had studied bear skulls and skeletons at the museum in Fairbanks before our trip,and I agree the tip of the nose is a good frontal shot.Spongy bone to the brain pan.
The slug hit the lower incisors,centered,and did not penetrate.It broke up.He went down and got back up.shaking his head.A second shot to the neck put him down.A 2 ' alder was bloody and apparently bitten in half by his head.Nose to tail,he was 6'6'' .The second slug was stopped by the spine.
I also killed a cow elk once with my .44 mag SBH.I used a 240 gr soft point.It was a neck shot,hit spine.The spine was smashed,but the slug stopped in the spine,total penetration 5 to 7 inches.
Another occasion,someone had left the sawn of head of a hog at a small dump where I used to shoot.Front to bak,not more than 6 or 7 in at the forehead.
I leaned it against a piece of plywood,and fired 6 240 gr softpoits from my .44.On the ground in front of the ply,lead and jacket frags.No penetration of the ply.
My point,I suggest leave the expanding bullets,and go hard cast Kieth.
After my experience,I built a light,glass stocked .375 Chatfied/Tayor for next time.
But, have never been to Kodiak,and I think cg coastie knows what he is talking about.