Currently, I'm kicking around the idea of doing a back country hunt in Montana (packing in on horse back) in a few years, and with the recent grizzly attacks in Yellowstone and such, I plan on taking my S&W M29 (6" barrel) to put under my pillow at night (better than a night light!

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If you had your choice, which bullet would you choose to use for self defense against a bear intent on gnawing on you for breakfast......a 240 grain JSP or a cast SWC-GC that weighs in around 250 grains?
Remember: this is for personal protection only.....I have no plans on "Hunting" bear with this round, only stopping them if I have to.
Thanks in advance...............