Dresden Files: Winter is coming (Cold Days Spoilers)

[Feytalist]

EDIT: Jim himself tells us it's a Winchester chambered for .45 Long Colt. Probably no magic in/on it.
But the fact that Jim not only tells us specifically what it is, but also opines on its abilities for self-defense, makes me think Harry's going to be using it.

That's a helluva lotta gun.

Also yeah, considering his comments, it's probably going to feature in the story.