Have a 1911 in 45 acp that I plan on taking with me hiking around Glacier National Park as just-in-case bear protection.

Though I know it is not the caliber of choice it is what I have, that and a 9mm, so what round would you suggest using in case I need it?

Not to worry, I've already purchased and plan to have the rest of my family carry pepper spray, as will I so that option is covered. Am just thinking worst case scenario or as the Boy Scouts say, "Be prepared."