The rifle was fired when they grabbed it, if you recall, so it's not loaded. And technically... I guess they could use blood bullets? Though that is one of those mechanics from the game that I have a really hard time translating to a more realistic perspective. Maybe making blood bullets requires some special tool to draw out blood and somehow condense it down to a hard bullet? The player-Hunter in the game does seem to use a syringe on their thigh when they create blood bullets... though we never actually see the player acquire such a tool. Eh, for now I think I'll say "no" to them being able to reload, too.