I imagine that if there are lions around, keeping a bit of a watch out along the back trail would be a Good Thing. If you see one, yell as loud as you can; that'll work 98% as well as a gun. If one is gonna jump you, an IPSC grand master couldn't draw and fire quickly enough to prevent a serious problem.
But any handgun of, say, .38 Special with a HydraShok or equivalent would be basically good enough. .357 or more is even better insurance.
Circumstance, time and distance. There's no "one size fits all".
Art
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