I've seen some photo's of those PA bears from last years hunt & some of them were giants, I"m talking really big bears, as Graybeard stated, some can go 800lbs, thats not average but they are there.
If you've never seen how fast a bear can move you are in for a thrill....or maybe the scare of your life, they are absolutely a blurr when they take off. If you are unfortunate enough to have one zero in on you believe me, you will want something you can HIT with, I see all the time of these huge handguns for bear protection & I'd like to see the man that can get off 2 shots at a charging bear from 20 yds in the less than 2 seconds he's going to have before everything goes dark! I've said many times, you have to be able to hit your target as they are not impressed with shots in the dirt.
You need the biggest gun you can shoot well & it must be loaded with tough ammo, most, not all of the jacketed stuff will fail unless its like the Norma FMJ, etc. You want tough bullets for tough game!
If your limit is a 357 then use it, if your limit is a 44 or bigger, thats even better but you gotta hit them!
My son's & I have taken 17 bears & I've been in on several others, not a huge number but it does give you some idea of what you're up against, they aren't terribly tough to kill unless you mess up but their speed can be very intimidating.
Record book black bear taken in 08 by my oldest son, this is one of 3 bears we took that year. This one is probably 400+ lbs & measured 7' 9".

Dick