Just another option to consider, I think, would be the new Remington Premier Expander slug made by Barnes, as well as the Remington Copper Solid slug. I have hunted in slug only areas my whole life, and I have used the old Remington Copper Solids, and I can tell you I have shot numerous deer with them and never recovered a slug yet. If the new barnes perform as well, I think that would be something to really take a look at also for your situation. These both are 1oz, or 437gr, @ 1450fps, and being all copper, will have very high weight retention as well as the reduced frontal area between the expanded petals compared to a typical mushroomed lead core. They also will have a slightly higher SD than a lead foster slug, due to being all copper but remaining the same weight, and as such will be longer. They are a sabot design and should give excellent accuracy for a shotgun. Certainly adequate for defense out to 50 yards. The new Accutips are great for deer, but they expand very wide, and I'm not positive penetration would not be limited somewhat due to that. If I had to carry a shotgun for bear protection as you, I believe it would be loaded with Copper Solids. Just my opinion, best of luck to you sir.