An off-the-shelf Chip McCormick magazine (for a full sized Govt model M1911) holds 8 rounds. FIne and well made magazine - I see them in the store all the time and they seem to sell well.
SO if the hiker was nutz enuf to carry in Condition One.... 9 rounds sounds about right.
Or the hiker could have been carrying a Tarus 24/7 Pro with a 14 rd magazine
Or a XD, or a Glock, or whatever-. THe news stories have never been specific, and the folks seem to be from Outside, as none of the local ‘news’ sources have tried for an interview.
But ya, I suppose if you carried a M1911 or knockoff 45, you would have the magazine in the weapon and two additional magazines for 24 rounds....
Even so, I'm not sure I'd want to tackle a grizzly with a .45.