I never chrono'ed the 300 gr XTP but that was my 1st load I developed, it was with 90 grs of BH 209.... Very accurate.
My buddy killed all of his deer with that load (7 deer total) He never had a recovery of a bullet - pass through every time. But he did say massive energy transfer by the way the hits looked. The deer would just walk drunkenly wobbling before falling over dead. He did say the exit holes were definitely bigger than entrance, closer to an inch.
I would think that would be a great bear load. I might run those over the chrono when I test out some other bullets I have next week.