I've loaded those for bear, and don't for a couple of reasons:
One is trajectory.... not the best.
The other is accuracy, the 300 grn cast performance always gave me better accuracy... for some reason or another, but you might have different experiences. Probably due to the fact of heavy recoil. I guess I was shooting them at about 1225fps..... But really, for black bear, you just don't need that much lead. Now for a brown bear, I could see you wanting as much lead as possible.
I was also wondering, where is the hassle in cast bullets? They don't have any of the issues the jacketed, hp, whatever bullets have.