This might be rambling a bit, but bear with me (pun intended)...
I have the DA Grizzly in 12.5", which I bought specifically as a bear protection gun. The problem I had with it was that with the stock bead, my point of impact was about a foot high at 20 yards.
I bought the XS Big Dot after doing a bit of reading around here, as others indicated that with the big dot being a bit higher, it fixed the POA/POI issues. I wanted to avoid ghost ring style sights, because they struck me as to bulky and snag prone on a scabbard, gun sock, or whatever. I wanted to keep it with as clean of lines as possible.
The big dot did a very good job of fixing the POA/POI issues, and I was surprised at how much better it made the gun for quick pointing. It wasn't really what I was after (I just wanted to fix the POA/POI issue), but that big dot really draws they eye to it and makes it easier to aim. I can (mostly) pick off a softball sized target with slugs now at about 10yds, and dinner plate accurate out to 25 - which is plenty accurate for the intended purpose.
I also put some thought into my standard load for bear defence, and ended up coming up with a mix load. I put 00 Buck on top, with 3 slugs as follow up. My thinking is that with 00 as the first round out, it increases my hit probability on that first shot, when the steaming mound that just appeared in my shorts is going to be detracting from my ability to aim well. 00 won't kill the bear, or even stop it, but it should do a good job of staggering it long enough to regain my composure and be able to get in some more precise follow up shots with the slugs.
FWIW, a little backstory on why I decided last year to start carrying a bush/bear gun, it might be help you understand my reasoning a bit:
I'm in my early 40s, and have been camping/hiking in the foothills and interior since I was about 8. Over that span of time, I've actually encountered grizzlies about a half dozen times, at ranges close enough "to be seriously concerned" about it. The first time was on a youth camping trip when I was 13 and, I kid you not, a bear (and it might of been a black bear, it was dark and I was so terrified I don't trust my own memories), strolled through the bush, stuck it's head into the lean-too, and gave a quick sniff of a half dozen kids my age, before deciding not to bother and moving on. The combined smell of all the crap pouring into a half dozen sleeping bags might have warded it off.
4 or 5 other times it was very typical type encounters. I'd be hiking along with others, and we'd round a corner in a trail, come to a T or X crossing in a trail, or step out into a clearing, and... Well just there it was. Invariably under 50 yards, and usually within 25 yards.
Every single time, the bear would give us a look over of complete indifference, and then carry on about its business.
In a lot of areas, the browns and blacks have become very habituated to people, especially in the National Parks and more heavily hiked areas. They aren't as big on avoiding people as they used to be.
Until last year, I always just stuck to the basics. Try and make a bit of noise as you're hiking, don't surprise them. Wear the dinner bells (old hiker joke), or a couple of loosely tied pots to your pack and let them clang away as you hike. To a certain extent, I had gotten a bit casual about it (stupid - casual and blase is what gets guys who have the experience and should know better killed in any of a hundred different ways in the woods).
Last year early in the spring I had my mind thoroughly changed on the subject with another encounter.
Essentially, it was the same as every other time I've come across them. I came out of a trail onto a cut-line, and there, not more than 30 yards off, was a wet and scraggly looking brown. It was Easter long weekend and raining, so the bear hadn't gotten a good feed on since the winter yet, and it didn't look all that impressed with the world. And it's reaction to me and my hiking partner?
It looked at us, gave a couple of casual sniffs, and wandered off about it's business. Exactly like my previous experiences.
The one thing that was different was my hiking partner. When you have your 4 year old daughter at your side and you experience this, your perspective takes a radical change. Ordered my shorty when we got back to town.
Anyway, dunno if this helps, but there it is for you. Hope you can find something that works out for you.